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Successive stages of mitosis or karyokinesis. A, B, C, D, and E illustrate the phenomena of the prophase; F those of the metaphase; G and H those of the anaphase; J, K, and L those of the telophase.

Reproduction of Cells

Successive stages of mitosis or karyokinesis. A, B, C, D, and E illustrate the phenomena of the prophase;…

The ovum and its coverings. The corona radiata, which completely surrounds the ovum, is only represented in the lower part of the figure. Labels: 1, corona radiate; 2, granular layer; 3, vitelline membrane; 4, zona pellucida (oolemma); 5, vitellus or yolk; 6, germinal vesicle (nucleus); 7, germinal spot (nucleolus); 8, nuclear membrane.

Ovum

The ovum and its coverings. The corona radiata, which completely surrounds the ovum, is only represented…

The maturation of the ovum. A, An ovum at the commencement process. B, After the formation of the spindle. The chromosomes are gathered at the equator of the spindle in groups of four, i.e. in tetrads, each which consists of two dyads. C, One apex of the spindle has projected into a bud on the surface, and the dyads have passed to the poles. D, The separation of the first polar body. E, The commencement of the second polar body; F, The completion of the second polar body.

Maturation of the Ovum

The maturation of the ovum. A, An ovum at the commencement process. B, After the formation of the spindle.…

An illustration of a girl holding a hoop and stick. Hoop Rolling, often called hoop and stick, is a child's game in which a large, hoop, made of wood, metal or plastic, is rolled along by means of a stick.

Girl with Toys

An illustration of a girl holding a hoop and stick. Hoop Rolling, often called hoop and stick, is a…

An illustration of Mount Vernon which is located near what is now Alexandria, Virginia. Mt. Vernon was the plantation home of the first President of the United States, George Washington. The mansion is built of wood in neoclassical Georgian architecture style, and the estate is located on the banks of the Potomac River.

Mount Vernon

An illustration of Mount Vernon which is located near what is now Alexandria, Virginia. Mt. Vernon was…

A sieve cell is a tubular cell having its wall one or more sharply circumscribed thin areas which are perforated as to resemble a sieve.

Sieve Cell

A sieve cell is a tubular cell having its wall one or more sharply circumscribed thin areas which are…

An illustration of a family sitting outside of a log cabin. A child is gathering wood on the left bottom, a woman is sheering a sheep directly in front of the cabin door, another woman is milking a cow, and a man is standing on the right side of the cabin.

Log Cabin

An illustration of a family sitting outside of a log cabin. A child is gathering wood on the left bottom,…

The developmental stages exhibited by a pyramidal cell of the brain. Labels: a, neuroblast with rudimentary axon, but no dendrites; b and c, the dendrites beginning to sprout out; d and e, further development of the dendrites and appearance of collateral branches on the axon.

Pyramidal Cells of the Brain

The developmental stages exhibited by a pyramidal cell of the brain. Labels: a, neuroblast with rudimentary…

Three stages in the development of a cell from a spinal ganglion.

Development of Cell from Spinal Ganglion

Three stages in the development of a cell from a spinal ganglion.

Section through the central canals of the spinal cord of a human embryo, showing ependymal (A) and neuroglial cells (B).

Section Through Spinal Cord Showing Neuroglial Cell

Section through the central canals of the spinal cord of a human embryo, showing ependymal (A) and neuroglial…

"Bragantia Blumei. 1. a section of its wood; 2. one of its flowers; 3. a seed; 4. the same divided perpendicularly; 5. anthers and stigma of Asarum." -Lindley, 1853

Bragantia

"Bragantia Blumei. 1. a section of its wood; 2. one of its flowers; 3. a seed; 4. the same divided perpendicularly;…

Transverse section through a cerebellar folium. Labels: A, axon of cell Purkinje; F, moss fibers; K and K', fibers from the white core of folium ending in molecular layer in connection with the dendrites of the cells of Purkinje; M, small cell of the molecular layer; GR, granule cell; M1, basket cell; ZK, basket work around the cells of Purkinje; GL, neuroglial cell; N, axon of an association cell.

Sagittal Section Through Cerebellar Folium

Transverse section through a cerebellar folium. Labels: A, axon of cell Purkinje; F, moss fibers; K…

Section through the molecular and granular layers in the long axis of a cerebellar folium. Labels: P, cell of Purkinje; GL, neuroglial cell; N, axon of a granule cell; N1, axons of granule cells in molecular layers.

Sagittal Section Through Cerebellar Folium

Section through the molecular and granular layers in the long axis of a cerebellar folium. Labels: P,…

Diagram to illustrate minute structure of the cerebral cortex. Labels: A and B, neuroglia cells; C, cells with short axon (N) which breaks up in free arborisation; D, spindle-shaped cell in stratum zonate; E, small pyramidal cell; F, large pyramidal cell; G, cell of Martinotti; H, polymorphic cell; K, corticipetal fibers.

Minute Structure of Cerebral Cortex

Diagram to illustrate minute structure of the cerebral cortex. Labels: A and B, neuroglia cells; C,…

Diagram of the minute structure of the olfactory bulb.

Minute Structure of Olfactory Bulb

Diagram of the minute structure of the olfactory bulb.

The longhorn beetles (Cerambycidae; also known as long-horned beetles or, more archaically, llongicorns) are a cosmopolitan family of beetles, typically characterized by extremely long antennae, which are often as long as or longer than the beetle's body. The family is large, with over 20,000 species described, slightly more than half from the Eastern Hemisphere. Several are serious pests, with the larvae boring into wood, where they can cause extensive damage to either living trees or untreated lumber.

Longhorn Beetle

The longhorn beetles (Cerambycidae; also known as long-horned beetles or, more archaically, llongicorns)…

This grenade consists of three parts: (1) a lemon-shaped, serrated, cast iron body; (2) a special igniter the body of which is a hollow piece of wood fixed in the collar of the grenade by three wooden pins; (3) the charge.

French Grenade (C.F.)

This grenade consists of three parts: (1) a lemon-shaped, serrated, cast iron body; (2) a special igniter…

Some chisels for cutting wood have two bezels, one on each side of the blade, as in the gardener's grafting chisel. Such a double-faced chisel is used for splitting open the limb of a tree.

Box Chisel

Some chisels for cutting wood have two bezels, one on each side of the blade, as in the gardener's grafting…

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from the work it does, for it is used to smooth or reduce wood to a true plane.

Side Plane

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from…

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from the work it does, for it is used to smooth or reduce wood to a true plane.

Circular Plane

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from…

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from the work it does, for it is used to smooth or reduce wood to a true plane.

Core Box Plane

With the plane, one can make rough wood true, smooth and beautiful. The name plane, perhaps, comes from…

The desire to reproduce in wood these old stone ornaments led to the invention of a great number of plane bits, and the use of these bits naturally inspired tool makers to devise a plane in which many different bits could be employed.

Universal Hand Beader

The desire to reproduce in wood these old stone ornaments led to the invention of a great number of…

The desire to reproduce in wood these old stone ornaments led to the invention of a great number of plane bits, and the use of these bits naturally inspired tool makers to devise a plane in which many different bits could be employed. This one will plane wood into fifty-two different forms by simply changing the bits.

Universal Plane

The desire to reproduce in wood these old stone ornaments led to the invention of a great number of…

Before the days of sawmills, the posts and beams of a house were manually cut out of logs. In building a frame house the old builders had a tool resembling an ax and called an adz. This is a wood-cutting tool with a curved blade and a straight cutting edge, with a bezel like a chisel.

Adz

Before the days of sawmills, the posts and beams of a house were manually cut out of logs. In building…

In wood working there are a number of fine tools used in cutting wood, in which a single or double shearing blade is used.

Wood Cutting Tool

In wood working there are a number of fine tools used in cutting wood, in which a single or double shearing…

A lathe is a machine tool which spins a block of material to perform various operations such as cutting, sanding, knurling, drilling, or deformation with tools that are applied to the workpiece to create an object which has symmetry about an axis of rotation.

Foot-power Wood-working Lathe

A lathe is a machine tool which spins a block of material to perform various operations such as cutting,…

A lathe is a machine tool which spins a block of material to perform various operations such as cutting, sanding, knurling, drilling, or deformation with tools that are applied to the workpiece to create an object which has symmetry about an axis of rotation.

Large Power Lathe

A lathe is a machine tool which spins a block of material to perform various operations such as cutting,…

A brace or brace and bit is a hand tool used to drill holes, usually in wood. Pressure is applied to the top and the tool is rotated with a U-shaped grip. The U-shaped part is a kind of crankshaft. It gives the brace much greater torque than other kinds of hand drill; a brace can be used to drill much wider, and deeper, holes than can a gear-driven hand drill.

Brace and Bits

A brace or brace and bit is a hand tool used to drill holes, usually in wood. Pressure is applied to…

Tammany Hall was the Democratic Party political machine that played a major role in controlling New York City politics and helping immigrants (most notably the Irish) rise up in American politics from the 1790s to the 1960s. It usually controlled Democratic Party nominations and patronage in Manhattan from the mayoral victory of Fernando Wood in 1854 up to (but not including) the election of Fiorello La Guardia in 1934, whereupon it weakened and collapsed.

Tammany Hall

Tammany Hall was the Democratic Party political machine that played a major role in controlling New…

Perpendicular section of mammalian retina. Labels: A, layer of rods and cones; B, outer nuclear layer; C, outer molecular layer; D, inner nuclear layer; E, inner molecular layer; F, ganglionic layer; G, stratum opticum; r, rods; c, cones, r.g, rod granules; c.g, cone granules; r.b, rod bipolars; c.b, cone bipolars; c.r, vontact of rod bipolars with the internal arborisation of cone bipolars; ar', internal arborisation of rod bipolars; c.n, centrifugal nerve fiber; h, horizontal cells; s.s, stratified spongioblasts; d.s, diffuse spongioblasts; s.g, stratified ganglion cell; M, sustentacular fiber of Muller.

Section of Retina

Perpendicular section of mammalian retina. Labels: A, layer of rods and cones; B, outer nuclear layer;…

The Western Battery was built by the British Army. With ample supply of trees from the surrounding area it was made of wood. It had two guns with a blockhouse.

Remains of the Western Battery in 1860

The Western Battery was built by the British Army. With ample supply of trees from the surrounding area…

Diagram to illustrate the arrangement of the blood vessels (on right) within the lobule of the liver. The first diagram shows the interlobular veins running around the outerside of the lobule, and sending their capillaries into the lobule to join the central radiation to the periphery of the lobule, where they can join the interlobular bile ducts.

Structure of Liver

Diagram to illustrate the arrangement of the blood vessels (on right) within the lobule of the liver.…

The Wood Thrush, Hylocichla mustelina, is a North American passerine bird. It is closely related to other thrushes such as the American Robin and is widely distributed across North America, wintering in Central America and southern Mexico. The Wood Thrush is the official bird of the District of Columbia.

Wood Thrush

The Wood Thrush, Hylocichla mustelina, is a North American passerine bird. It is closely related to…

The term woodboring beetle encompasses many species and families of beetles whose larval or adult forms eat and destroy wood (i.e., are xylophagous). Larval stages of some are commonly known as woodworms.

Woodboring Beetle

The term woodboring beetle encompasses many species and families of beetles whose larval or adult forms…

The Western Wood-Pewee, Contopus sordidulus, is a small tyrant flycatcher. Adults are gray-olive on the upperparts with light underparts, washed with olive on the breast. They have two wing bars and a dark bill with yellow at the base of the lower mandible. This bird is very similar in appearance to the Eastern Wood-Pewee; the two birds were formerly considered to be one species.

Western Wood Pewee

The Western Wood-Pewee, Contopus sordidulus, is a small tyrant flycatcher. Adults are gray-olive on…

An illustration of a wood-boring beetle

Wood-boring Beetle

An illustration of a wood-boring beetle

An illustration of a wood-boring beetle known as an apple tree borer.

Apple Tree Borer

An illustration of a wood-boring beetle known as an apple tree borer.

The American Bison (Bison bison) is a bovine mammal, also commonly known as the American buffalo. 'Buffalo' is something of a misnomer for this animal as it is only distantly related to either of the two "true buffaloes", the water buffalo and the African Buffalo. The bison once inhabited the Grasslands of the United States and Asia in massive herds, ranging from the Great Slave Lake in Canada's far north to Mexico in the south, and from eastern Oregon almost to the Atlantic Ocean, taking its subspecies into account. Its two subspecies are the Plains Bison (Bison bison bison), distinguished by its smaller size and more rounded hump, and the Wood Bison (Bison bison athabascae), distinguished by its larger size and taller square hump. Wood Bison are one of the largest species of cattle in the world, surpassed in size only by the massive Asian gaur and Wild Asian Water Buffalo, both of which are found mainly in India and Southeast Asia.

North American Bison

The American Bison (Bison bison) is a bovine mammal, also commonly known as the American buffalo. 'Buffalo'…

A wood-saw hanging on a sawhorse, which is a legged beam to support a piece of wood while sawing.

Sawhorse

A wood-saw hanging on a sawhorse, which is a legged beam to support a piece of wood while sawing.

An illustration of an anamirta cocculus leaf. Anamirta cocculus is an Southeast Asian and Indian climbing plant. Its fruit, Cocculus indicus, is the source of picrotoxin, a poisonous alkaloid with stimulant properties. The plant is large-stemmed (up to 10cm in diameter); the bark is "corky gray" with white wood. The "small, yellowish-white, sweet-scented" flowers vary between 6 to 10 centimeters across; the fruit produced is a drupe, "about 1 cm in diameter when dry".

Anamirta cocculus

An illustration of an anamirta cocculus leaf. Anamirta cocculus is an Southeast Asian and Indian climbing…

An illustration of an anamirta cocculus branch with flowers. Anamirta cocculus is an Southeast Asian and Indian climbing plant. Its fruit, Cocculus indicus, is the source of picrotoxin, a poisonous alkaloid with stimulant properties. The plant is large-stemmed (up to 10cm in diameter); the bark is "corky gray" with white wood. The "small, yellowish-white, sweet-scented" flowers vary between 6 to 10 centimeters across; the fruit produced is a drupe, "about 1 cm in diameter when dry".

Anamirta cocculus Flowers

An illustration of an anamirta cocculus branch with flowers. Anamirta cocculus is an Southeast Asian…

An illustration of an anamirta cocculus female flower. Anamirta cocculus is an Southeast Asian and Indian climbing plant. Its fruit, Cocculus indicus, is the source of picrotoxin, a poisonous alkaloid with stimulant properties. The plant is large-stemmed (up to 10cm in diameter); the bark is "corky gray" with white wood. The "small, yellowish-white, sweet-scented" flowers vary between 6 to 10 centimeters across; the fruit produced is a drupe, "about 1 cm in diameter when dry".

Anamirta cocculus Flower (Female)

An illustration of an anamirta cocculus female flower. Anamirta cocculus is an Southeast Asian and Indian…

An illustration of an anamirta cocculus fruit. Anamirta cocculus is an Southeast Asian and Indian climbing plant. Its fruit, Cocculus indicus, is the source of picrotoxin, a poisonous alkaloid with stimulant properties. The plant is large-stemmed (up to 10cm in diameter); the bark is "corky gray" with white wood. The "small, yellowish-white, sweet-scented" flowers vary between 6 to 10 centimeters across; the fruit produced is a drupe, "about 1 cm in diameter when dry".

Anamirta cocculus Flower (Female)

An illustration of an anamirta cocculus fruit. Anamirta cocculus is an Southeast Asian and Indian climbing…

An illustration of an anamirta cocculus male flower. Anamirta cocculus is an Southeast Asian and Indian climbing plant. Its fruit, Cocculus indicus, is the source of picrotoxin, a poisonous alkaloid with stimulant properties. The plant is large-stemmed (up to 10cm in diameter); the bark is "corky gray" with white wood. The "small, yellowish-white, sweet-scented" flowers vary between 6 to 10 centimeters across; the fruit produced is a drupe, "about 1 cm in diameter when dry".

Anamirta cocculus Flower (Male)

An illustration of an anamirta cocculus male flower. Anamirta cocculus is an Southeast Asian and Indian…

An illustration of an anamirta cocculus male flower with the sephals removed. Anamirta cocculus is an Southeast Asian and Indian climbing plant. Its fruit, Cocculus indicus, is the source of picrotoxin, a poisonous alkaloid with stimulant properties. The plant is large-stemmed (up to 10cm in diameter); the bark is "corky gray" with white wood. The "small, yellowish-white, sweet-scented" flowers vary between 6 to 10 centimeters across; the fruit produced is a drupe, "about 1 cm in diameter when dry".

Anamirta cocculus Fruit

An illustration of an anamirta cocculus male flower with the sephals removed. Anamirta cocculus is an…

Cricket is a bat-and-ball team sport that originated in England and is now played in more than 100 countries. A cricket match is contested by two teams, usually of eleven players each and is played on a grass field in the centre of which is a flat strip of ground 22 yards (20 m) long called a pitch. A wicket, usually made of wood, is placed at each end of the pitch and used as a target. The bowler, a player from the fielding team, bowls a hard leather, fist-sized, 5.5 ounces (160 g) cricket ball from the vicinity of one wicket towards the other, which is guarded by the batsman, a player from the opposing team. The ball usually bounces once before reaching the batsman. In defence of his wicket, the batsman plays the ball with a wooden cricket bat. Meanwhile, the other members of the bowler's team stand in various positions around the field as fielders, players who retrieve the ball in an effort to stop the batsman scoring runs, and if possible to get him or her out. The batsman — if he or she does not get out — may run between the wickets, exchanging ends with a second batsman (the "non-striker"), who has been stationed at the other end of the pitch. Each completed exchange of ends scores one run. Runs are also scored if the batsman hits the ball to the boundary of the playing area. The match is won by the team that scores more runs.

Cricket Field

Cricket is a bat-and-ball team sport that originated in England and is now played in more than 100 countries.…

Mount Vernon, located near Alexandria, Virginia, was the plantation home of the first President of the United States, George Washington. The mansion is built of wood in neoclassical Georgian architectural style, and the estate is located on the banks of the Potomac River.

Mount Vernon in Washington's Day

Mount Vernon, located near Alexandria, Virginia, was the plantation home of the first President of the…

An illustration of a wood statue of a man dated back to 2600 B. C.

Statue of Man

An illustration of a wood statue of a man dated back to 2600 B. C.

An illustration of an Egyptian seat made of ivory and ebony wood.

Egyptian Ivory and Ebony Seat

An illustration of an Egyptian seat made of ivory and ebony wood.

An Egyptian carved wooden spoon with cover.

Carved Wooden Spoon with Cover

An Egyptian carved wooden spoon with cover.

Structure of the protonephridium (excretory organ) of a flatworm. A, part of the excretory apparatus of a tapeworm; R, edge of body; c, collecting tubules. B, terminal cells with flame of cilia. C, diagram of terminal cell, excretory capillary, and canal.

Protonephridium

Structure of the protonephridium (excretory organ) of a flatworm. A, part of the excretory apparatus…

A scauper or scorper is a engraver's tool used to scoop out broad areas.

Scauper

A scauper or scorper is a engraver's tool used to scoop out broad areas.

The Olive (Olea europaea) is a species of small tree in the family Oleaceae, native to the coastal areas of the eastern Mediterranean region, from Lebanon, Syria and the maritime parts of Asia Minor and northern Iran at the south end of the Caspian Sea. Its fruit, the olive, is of major agricultural importance in the Mediterranean region as the source of olive oil. The Olive tree is an evergreen tree or shrub native to the Mediterranean, Asia and parts of Africa. It is short and squat, and rarely exceeds 8–15 meters in height. The silvery green leaves are oblong in shape, measuring 4–10 cm long and 1–3 cm wide. The trunk is typically gnarled and twisted. The small white flowers, with four-cleft calyx and corolla, two stamens and bifid stigma, are borne generally on the last year's wood, in racemes springing from the axils of the leaves. The fruit is a small drupe 1–2.5 cm long, thinner-fleshed and smaller in wild plants than in orchard cultivars. Olives are harvested at the green stage or left to ripen to a rich purple colour (black olive). Canned black olives may contain chemicals that turn them black artificially.

Olive Branch

The Olive (Olea europaea) is a species of small tree in the family Oleaceae, native to the coastal areas…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

Eleazer Derby Wood (1783 – September 17, 1814) was an American Army officer in the War of 1812. He was distinguished at Fort Erie, where he lost his life in a sortie. Colonel Wood was much beloved by General Brown, who caused a handsome marble monument to be erected to his memory at West Point. Also, he was the namesake of Fort Wood on Bedloe's Island in New York Harbor on which the Statue of Liberty was built. He is also the namesake of Wood County, Ohio.

Colonel Eleazer Derby Wood's Monument at West Point

Eleazer Derby Wood (1783 – September 17, 1814) was an American Army officer in the War of 1812.…

Fernando Wood (June 14, 1812 – February 14, 1881) is famous for being one of the most colorful mayors in the history of New York. He was chairman of the chief young men's political organization in 1839 and was a member of the Tammany Society, which he used as a vehicle for his political rise. Wood served as Mayor of New York from 1855 to 1862. During this time a police feud developed between the New York Municipal Police and the Metropolitan Police Force. This feud led to increased gang activity due to the police rivaling one another rather than upholding the law. Wood was one of many New York Democrats sympathetic to the Confederacy, called 'Copperheads' by the staunch Unionists. In January 1861, Wood suggested to the City Council that New York secede and declare itself a free city.

Fernando Wood

Fernando Wood (June 14, 1812 – February 14, 1881) is famous for being one of the most colorful mayors…

Leonard Wood (October 9, 1860 – August 7, 1927) was a physician who served as the Chief of Staff of the United States Army, Military Governor of Cuba and Governor General of the Philippines. Early in his military career, he was awarded the Medal of Honor.

Leonard Wood

Leonard Wood (October 9, 1860 – August 7, 1927) was a physician who served as the Chief of Staff of…

An illustration of a hand loom. he earliest looms were vertical warp-weighted looms, with the warp threads suspended from a branch or piece of wood and weighted or attached to the ground. The weft threads would be pushed into place by hand or a stick that would eventually become the shuttle. At first, it was necessary to raise and lower every warp thread one at a time, which was a time-consuming and laborious process. Basic techniques, such as the insertion of a rod, were developed to produce a shed, the space between warp threads (perhaps every other thread would be alternately raised and lowered), so that the weft thread or shuttle could pass through the entire warp at once.

Hand Loom

An illustration of a hand loom. he earliest looms were vertical warp-weighted looms, with the warp threads…