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Illustration of a child washing face at 7:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 7:00 Story Problem

Illustration of a child washing face at 7:00. It can be used to write mathematics story problems involving…

Illustration of a child eating breakfast at 8:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 8:00 Story Problem

Illustration of a child eating breakfast at 8:00. It can be used to write mathematics story problems…

Illustration of a child going up stairs at 9:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 9:00 Story Problem

Illustration of a child going up stairs at 9:00. It can be used to write mathematics story problems…

Illustration of a child reading at school at 10:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 10:00 Story Problem

Illustration of a child reading at school at 10:00. It can be used to write mathematics story problems…

Illustration of a child reading at school at 11:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 11:00 Story Problem

Illustration of a child reading at school at 11:00. It can be used to write mathematics story problems…

Illustration of a child running at 12:00 noon. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 12:00 Noon Story Problem

Illustration of a child running at 12:00 noon. It can be used to write mathematics story problems involving…

Illustration of a child walking at 1:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 1:00 Story Problem

Illustration of a child walking at 1:00. It can be used to write mathematics story problems involving…

Illustration of a child writing roman numerals at 2:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 2:00 Story Problem

Illustration of a child writing roman numerals at 2:00. It can be used to write mathematics story problems…

Illustration of a child making a clock face at 3:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 3:00 Story Problem

Illustration of a child making a clock face at 3:00. It can be used to write mathematics story problems…

Illustration of a child hugging his mother at 4:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 4:00 Story Problem

Illustration of a child hugging his mother at 4:00. It can be used to write mathematics story problems…

Illustration of a child hauling wood at 5:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 5:00 Story Problem

Illustration of a child hauling wood at 5:00. It can be used to write mathematics story problems involving…

Illustration of a child running with a pail at 6:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 6:00 Story Problem

Illustration of a child running with a pail at 6:00. It can be used to write mathematics story problems…

Illustration of a child playing toy soldiers at 7:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 7:00 Story Problem

Illustration of a child playing toy soldiers at 7:00. It can be used to write mathematics story problems…

Illustration of a child yawning at 8:00. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 8:00 Story Problem

Illustration of a child yawning at 8:00. It can be used to write mathematics story problems involving…

Illustration of a child sleeping all night: 9:00pm to 7:00am. It can be used to write mathematics story problems involving telling time and roman numerals.

Telling Time 9:00pm to 7:00am Story Problem

Illustration of a child sleeping all night: 9:00pm to 7:00am. It can be used to write mathematics story…

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic. 11, reduction division, the double chromosomes separating and at the same time showing longitudinal division, with the longitudinal halves widely apart at their equatorial ends." -Stevens, 1916

Division of Grandmother Cell Stage 11

"Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic.…

A Russian field kitchen used in a time of war or hardship.

A Russian Field Kitchen

A Russian field kitchen used in a time of war or hardship.

"Fracture of the thigh: Apply a long splint, reaching from the armpit to beyond the foot on the outside, and a short splint on the inside." -Moss, 1914

Splint

"Fracture of the thigh: Apply a long splint, reaching from the armpit to beyond the foot on the outside,…

"Gradual transitions between Paludina neumayri (a), the oldest form, and Paludina hoernesi (j)." -Thomson, 1916

Neumayr Transitions

"Gradual transitions between Paludina neumayri (a), the oldest form, and Paludina hoernesi (j)." -Thomson,…

"Diagram of a Ctenophore. M., Mouth; S., sensory organ; T., tentacle cut short; SH., pouch of tentacle; C., ciliated combs; F., funnel or central canal; SV., paragastric canal running parallel with stomodaeum; G., other canals of the gut; V., one of the meridional canals, bearing gonads, running under the bands of ciliated combs." -Thomson, 1916

Ctenophore

"Diagram of a Ctenophore. M., Mouth; S., sensory organ; T., tentacle cut short; SH., pouch of tentacle;…

"Diagram of the structure of a male Nematode. M., mouth; OE., oesophogus; GA., nerve ring; B., bulb at lower end of fore-gut; G., mesenteron; SP., spine with sheath; A., anus; D., ejaculatory duct; VS., seminal vesicle; T., testis; ET., longitudinal excretory tube, cut short; EP., excretory pore." -Thomson, 1916

Nematode

"Diagram of the structure of a male Nematode. M., mouth; OE., oesophogus; GA., nerve ring; B., bulb…

"Nervous system of shore-crab (Carcinus manas). br., The supra-oesophageal mass; g., gullet surrounded by gr., the gullet ring; m., the sub-oesophageal mass representing a fusion of the thoracic ganglia of the crayfish, and giving off nerves to the limbs; behind it is a short strand representing the abdominal ganglia of the crayfish. a1., antennules; a2., antennae; e., eye." -Thomson, 1916

Shore Crab Nervous System

"Nervous system of shore-crab (Carcinus manas). br., The supra-oesophageal mass; g., gullet surrounded…

"Roman snail (Helix pomatia). Note shell covering visceral hump; p.ap., pulmonary aperture (including anus and opening of ureter); f., the foot; g.ap., genital aperture; m., mouth; e., eye on long horn; s.h., one of short horns." -Thomson, 1916

Roman Snail

"Roman snail (Helix pomatia). Note shell covering visceral hump; p.ap., pulmonary aperture (including…

"Dissection of snail. T., Short horn; TT., long horn with eye; N., cerebral ganglia; S.G., salivary glands on the crop; F., foot; M., columellar muscle; V.C., visceral coil; O.T., ovotestis; V., ventricle of heart; R. rectum; U., ureter; B.V., blood vessels returning to the auricle from the mantle; A., pulmonary aperture; MA., edge of the mantle." -Thomson, 1916

Dissection

"Dissection of snail. T., Short horn; TT., long horn with eye; N., cerebral ganglia; S.G., salivary…

"Diagram of the structure of Sepia. a., Eight short arms around mouth; l.a., one of the two long arms; b., beak of the mouth; c.g., cerebral ganglia, with commissures to the others; E., eye; g., gullet; d.g., digestive gland (the "salivary glands" are not represented); st., stomach; a., anus; sh., shell-sac with sepiostaire; k., kidney; R., reproductive organ; br.h., branchial heart; g., a gill; i.b., ink-bag; m.c., mantle cavity; f., funnel." -Thomson, 1916

Cuttlefish Structure

"Diagram of the structure of Sepia. a., Eight short arms around mouth; l.a., one of the two long arms;…

A portion of fibrin, showing its fibrous structure and netlike arrangement of its fibers. In a short time after the blood is taken from the body it separates into two portions, by a process called coagulation or clot; the white substance which forms the upper part of the clot is called fibrin, and the red mass under it, the red particles. The fibrin is the material from which all solids of the body are formed.

Blood Clotting Fibers

A portion of fibrin, showing its fibrous structure and netlike arrangement of its fibers. In a short…

"Diagram showing the heart and general course of the circulation in the lamellibranchs. Only a short section is shown. a, auricle (right), with slit to ventricle; b, the body (region of spaces, lacunae, capillaries; v, the ventricle from which arteries pass forward and their capillaries; m, the mantle and capillaries; v, ventricle from which arteries pass forward and backward; v.c., "vena cava," in which the blood collects on returning from the tissues of the body." -Galloway, 1915

Bivalve Circulation

"Diagram showing the heart and general course of the circulation in the lamellibranchs. Only a short…

An illustration of a promissory note. "A promissory note is a written promise to pay a specified sum of money at a stated time."

Promissory Note

An illustration of a promissory note. "A promissory note is a written promise to pay a specified sum…

An illustration of a promissory note that has been indorsed. "A promissory note is a written promise to pay a specified sum of money at a stated time."

Indorsed Promissory Note

An illustration of a promissory note that has been indorsed. "A promissory note is a written promise…

An illustration of a promissory note that has been indorsed by more than one person. "Each indorser can be held responsible for the payment of the note, should the maker fail to keep his promise to pay at the specified time."

Indorsed Promissory Note

An illustration of a promissory note that has been indorsed by more than one person. "Each indorser…

An illustration of a commercial draft for $122.50. "A commercial draft is a written order by which one person directs a second person to pay a specified sum of money at a stated time, through a bank."

Commercial Draft

An illustration of a commercial draft for $122.50. "A commercial draft is a written order by which one…

A round clock face with dash marks showing no time.

Blank Clock

A round clock face with dash marks showing no time.

A round clock face with numbers showing no time.

Blank Clock

A round clock face with numbers showing no time.

A round clock face with roman numerals showing no time.

Blank Clock

A round clock face with roman numerals showing no time.

A six-foot man drawn to scale during the time period of miocene.

Six Foot man

A six-foot man drawn to scale during the time period of miocene.

A early horned deer during the time period of Miocene.

Early Horned Deer

A early horned deer during the time period of Miocene.

A early horned deer during the time period of Miocene.

Early Horned Deer

A early horned deer during the time period of Miocene.

A primitive desert horse during the time period of Miocene.

Desert Horse

A primitive desert horse during the time period of Miocene.

A full body picture of a long-jawed mastodon during the time period of Miocene.

Long-jawed Mastodon

A full body picture of a long-jawed mastodon during the time period of Miocene.

Philip became king of Macedonia in 359 B.C. He was viewed as he best educated man of his time.

Philip of Macedon

Philip became king of Macedonia in 359 B.C. He was viewed as he best educated man of his time.

"Dimorphous flowers of the primrose. I, a long-styled flower; II, a short-styled one." -Bergen, 1896

Primrose Flowers

"Dimorphous flowers of the primrose. I, a long-styled flower; II, a short-styled one." -Bergen, 1896

Conflict with a rattlesnake. Caption below illustration: "The snake when about a yard distant, made a violent spring. Jervas caught it in his right hand, directly under his head. He squeezed it with all his power. Its eyes almost started out of its head. It lashed its body on the ground, at the same time rattling loudly."

Conflict with a Rattlesnake

Conflict with a rattlesnake. Caption below illustration: "The snake when about a yard distant, made…

"Comparative time, when noon in Chicago." -Foster, 1921

Comparative Time

"Comparative time, when noon in Chicago." -Foster, 1921

"Comparative time, when noon in Toronto." -Foster, 1921

Comparative Time

"Comparative time, when noon in Toronto." -Foster, 1921

"Stereotyping is the art of fabricating metal plates resembling pages of type, which impressions may be taken as in letter-press printing, is termed stereotyping."-Lupton

Stereotyping

"Stereotyping is the art of fabricating metal plates resembling pages of type, which impressions may…

"a genus of algae. P.nivalis (red-snow) appears on the surface of snow, tinging extensive tracts in the Arctic regions or amongst the Alps, in an incredibly short space of time, with a deep crimson. This plant may be regarded a s one of the simplest forms of vegetation." -Marshall

Protococcus Algae

"a genus of algae. P.nivalis (red-snow) appears on the surface of snow, tinging extensive tracts in…

"In a system in which each pulley hangs by a separate cord and the strings are parallel (fig. 5), there is an equilibrium when the power is to the weight as 11 to that power of 2 whose index is the number of movable pulleys." -Marshall

Pulley

"In a system in which each pulley hangs by a separate cord and the strings are parallel (fig. 5), there…

An illustration showing how to construct an ellipse. "With a as a center, draw two concentric circles with diameters equal to the long and short axes of the desired ellipse. Draw from o any number of radii, A, B, etc. Draw a line Bb' parallel to n and bb' parallel to m, then b is a point in the desired ellipse.

Construction Of An Ellipse

An illustration showing how to construct an ellipse. "With a as a center, draw two concentric circles…

An illustration showing how to construct an ellipse using circle arcs. "Given the two axes, set off the short axis from A to b, divide b into three equal parts, set off two of these parts from o towards c and c which are the centers for the ends of the ellipse. Make equilateral triangles on cc, when ee will be the centers for the sides of the ellipse. If the long axis is more than twice the short one, this construction will not make a good ellipse."

Construction Of An Ellipse

An illustration showing how to construct an ellipse using circle arcs. "Given the two axes, set off…

A clock that reads 10:38.

10:38

A clock that reads 10:38.

"A cord of wood is a solidly built pile of 8 feet long, 4 feet wide and 4 feet high. 1. How many cords, stove-wood measure, each stick 12 inches long, could be made from a full-sized cord of wood? 2. If the full cord as pictured above is bought for $3.00 and sawed into stove lengths as in problem (1) and sold for $1.25 a cord, what is the profit? 3. If 6 hours' time was required to saw this wood, and labor cost 25 cents per hour, was there anything gained on the transaction?" -Foster, 1921

Cord of Wood

"A cord of wood is a solidly built pile of 8 feet long, 4 feet wide and 4 feet high. 1. How many cords,…

Long and short work. Saxon Architecture is the earliest stage of native English architecture, its period being from the conversion of England to Christianity till the conquest or near it, when Norman architecture began to prevail.

Long and Short Saxon Architecture

Long and short work. Saxon Architecture is the earliest stage of native English architecture, its period…

In some species of fish the small intestine is in two to eight coils. The large intestines are short and straight, and the termination of the rectum opens into a cavity called the Cloaca. Labels: 1, Liver, 2, 3, Caecas or pouches connecting with small intestines. 4, 5, Small intestine, coiled. 6, Large intestine. 7, Biliary duct.

The Alimentary Canal of the Swordfish

In some species of fish the small intestine is in two to eight coils. The large intestines are short…

"Generalized columnar section, northern Black Hills." -Walcott, 1901

Strata Thickness

"Generalized columnar section, northern Black Hills." -Walcott, 1901

The power possessed by the hand of a human is chiefly depended upon the size and power of the thumb, which is more developed in humans than it is in the highest apes. The thumb of the human hand can be brought into exact opposition to the extremities of all the fingers, whether singly or in combination; while in those quandrumana which most nearly approach man, the thumb is so short, and the fingers are so weak that they can never be opposed to each other with any degree of force. The human foot is, in proportion to the side of the whole body, larger, broader, and stronger than that of any other mammal.

Comparison of the Hand and the Foot of a Monkey and Human

The power possessed by the hand of a human is chiefly depended upon the size and power of the thumb,…

Muscular fiber cells from the heart. The fibers which lie side by side are united at frequent intervals by short branches.

Muscular Fiber Cells from the Heart

Muscular fiber cells from the heart. The fibers which lie side by side are united at frequent intervals…

Several fibers of a bundle of medullated nerve fibers acted upon by silver nitrate to show peculiar behavior of nodes of Ranvier, N, towards this reagent. The silver has penetrated at the nodes, and has stained the axis cylinder, M, for a short distance. S, the white substance.

Behavior of the Nodes of Ranvier

Several fibers of a bundle of medullated nerve fibers acted upon by silver nitrate to show peculiar…

Acetic acid (dilute) causes the nucleus of the red blood cells in the frog to become more clearly defined; if the action is prolonged, the nucleus becomes strongly granulated, and all the coloring matter seems to be concentrated in it, the surrounding cell substance and outline of the cell becoming almost invisible; after a time the cells lose their color altogether. The cells shown represent the successive stages of change. A similar loss of color occurs in the red cells of human blood, which , however, from the absence of nuclei, seem to disappear entirely.

Effect of Acetic Acid on Red Blood Cells

Acetic acid (dilute) causes the nucleus of the red blood cells in the frog to become more clearly defined;…

The right auricle and ventricle opened, and a part of their right and anterior walls removed, so as to show their interior. Labels: 1, superior vena cava; 2, inferior vena cava; 2', heptic veins cut short; 3, right auricle; 3', placed in the fossa ovalis, below which is the Eustachian valve; 3", is placed close to the aperture of the coronary adjacent walls of the auricle and ventricle has been preserved; 4, cavity of the right carnea or musculus papillaris; 5, 5', 5", tricuspid valve; 6, placed in the interior of the pulmonary artery, a part of the anterior wall of that vessel having been removed, and a narrow portion of it preserved at its commencement, where the semilunar valves are attached; 7, concavity of the aortic arch close to the cord of the ductus arteriosus; 8, ascending part or sinus of the arch covered at its commencement by the auricular arteries; 10, appendix of the left auricle; 11, the outside of the left ventricle, the lower figure near the apex.

A Diagram of the Heart

The right auricle and ventricle opened, and a part of their right and anterior walls removed, so as…

The left auricle and ventricle opened and a part of their anterior and left walls removed. The pulmonary artery has been divided at its commencement; the opening into the left ventricle is carried a short distance into the aorta between two of the segments of the semilunar valves; and the left part of the auricle with its appendix has been removed. The right auricle is out of view. Labels: 1, the two right pulmonary veins cut short; their opening are seen within the auricle; 1' , placed within the cavity of the auricle on the left side of the septum and on the right side and on the part which forms the remains of the valve of the foramen ovale, of which the crescentic fold is seen towards the left hand of 1'; 2, a narrow portion of the wall of the auricle and ventricle preserved round the auriculo-ventricular orifice; 3, 3', the cut surface of the walls of the ventricle, seen to become very much thinner towards 3", at the apex; 4, a small part of the anterior wall of the left ventricle which has been preserved with the principle anterior columna carnea or musculus papillaris attached to it; 5. ,musculi papillares; 5', the left side of the septum, between the two ventricles, within the cavity of the left ventricle; and above the three segments of its semilunar valve which are hanging loosely together; 7', the exterior of the great aortic sinus; 8, the root of the pulmonary artery and its semilunar valves; 8' the separated portion of the pulmonary artery remaining attached to the aorta by 9, the cord of the ductus arteriosus; 10, the arteries rising from the summit of the aortic arch.

A Diagram of the Heart

The left auricle and ventricle opened and a part of their anterior and left walls removed. The pulmonary…