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"The <em>Gyrinus Striatus</em> is found in the waters of Southern Europe. These insects are all small, not exceeding, as a rule, one fifth of an inch in length."

Gyrinus Striatus

"The Gyrinus Striatus is found in the waters of Southern Europe. These insects are all small,…

"A distinct species, which exists in a little lake of mineral waters in France, where visitors amuse themselves by fishing for them with a line baited with bits of red cloth, which it attacks."

Gyrinus Distinctus

"A distinct species, which exists in a little lake of mineral waters in France, where visitors amuse…

"A larger species from Brazil, with very long front legs."

Epinectus Sulcatus

"A larger species from Brazil, with very long front legs."

"The pores of sponges are of two kinds, the larger ones called 'oscula'" and the smaller distinguished as 'pores.' In the living state of the sponge, water is being constantly absorbed by the pores, while currents of water will be seen issuing from the oscula."

Sponge Attached to its Rocky Bed

"The pores of sponges are of two kinds, the larger ones called 'oscula'" and the smaller distinguished…

"These little creatures frequently have the appearance of small, rounded masses, like drops of water. They are naked, without any apparent organization."

Amoeba Princeps (Ehrenberg)

"These little creatures frequently have the appearance of small, rounded masses, like drops of water.…

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in lakes and ponds of fresh water."

Volvox Globular

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in…

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in lakes and ponds of fresh water."

Volvox Globular

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in…

A tube open at both ends with the lower end covered with a piece of card, plunged into the water. The liquid will press the card against the bottom of the tube with a force which increases as it is plunged deeper.

Upward Pressure

A tube open at both ends with the lower end covered with a piece of card, plunged into the water. The…

Mercury, water, and oil are poured into a glass jar. The mercury goes to the bottom, the oil floats at the top, the surfaces of contact are seen to be horizontal.

Phial of the Four Elements

Mercury, water, and oil are poured into a glass jar. The mercury goes to the bottom, the oil floats…

An egg dropped in fresh and salt water to show the properties of density.

Egg Plunged in Fresh and Salt Water

An egg dropped in fresh and salt water to show the properties of density.

One of the commonest ways of determining the density of a solid body is to weight it first in air and then in water.

Specific Gravity of Solids

One of the commonest ways of determining the density of a solid body is to weight it first in air and…

The instrument called the water-level illustrates the principle of equilibrium in vessels communicating with each other.

Water-level

The instrument called the water-level illustrates the principle of equilibrium in vessels communicating…

"The Blue Minyad is a type of a family in which the base of the body, in place of extending itself in a disk-like form, in order to grapple with the rocks and other projections at the bottom of the sea, turns itself inward, forming a sort of purse, which seems to imprison the air. From this results a sort of hydrostatic apparatus, aided by which the animals can float in the water and transport themselves from one place to another."

Blue Minyad (Minyas Cyanea)

"The Blue Minyad is a type of a family in which the base of the body, in place of extending itself in…

"The <em>Tubipora</em> is a calcareous coral, formed by the combination of distinct, regularly arranged tubes, connected together at regular distances by lamellar expansions of the same material." This figure shows the crown of delicately fringed tentacula of a individual polyp.

Crown of Delicately Fringed Tentacula of Tubipora Musica

"The Tubipora is a calcareous coral, formed by the combination of distinct, regularly arranged…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>."

Gorgonia Flabellum

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>."

Magnified Portion of Fan Gorgon

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>. The Whorled Gorgon, which is found in the Mediterranean, is of elegant form."

Gorgonia Verticellata

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>. The Whorled Gorgon, which is found in the Mediterranean, is of elegant form."

Magnified Portion of Gorgonia Verticellata

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"A species of <em>Isis</em> has numerous slender branches, furnished with cylindrical knows at intervals, contracted toward the middle, finely striated; it has a singular resemblance to the Common Mare's Tail."

Isis Hippuris

"A species of Isis has numerous slender branches, furnished with cylindrical knows at intervals,…

"The polyp itself is formed of a whitish, membranous tube, nearly cylindrical, having an upper disk, surrounded by its eight tentacula, bearing many delicate pinnae spreading out laterally. These tentacula resemble the corolla of some flower."

Coral Polyp (Lacaze-Duthiers)

"The polyp itself is formed of a whitish, membranous tube, nearly cylindrical, having an upper disk,…

"The arms of the polyps are at times subject to violent agitation, and the tentacula become much excited. If this excitement continues, the tentacula can be seen to fold and roll themselves up. The little opening around which these tentacula are attached forms the mouth of the polyp."

Coral Polyp (Lacaze-Duthiers)

"The arms of the polyps are at times subject to violent agitation, and the tentacula become much excited.…

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a great quantity of pointed spiculae, which are constituted of bundles at the base of the calyx of each polyp. This figure shows one which inhabits the Mediterranean Sea."

Pennatula Spinosa

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a…

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a great quantity of pointed spiculae, which are constituted of bundles at the base of the calyx of each polyp. The polyps appear upon the waving and deeply indented lobes."

Loose Winged Virgularia (Virgularia Mirabilis)

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a…

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a great quantity of pointed spiculae, which are constituted of bundles at the base of the calyx of each polyp. The polyps appear upon the waving and deeply indented lobes."

Branch of Loose Winged Virgularia

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a…

"The <em>Umbellularia Groenlandica</em> has a very long stem, which is terminated at the summit only by a cluster of polyps. It is an inhabitant of the northern seas."

Umbellularia Groenlandica (Lamarck)

"The Umbellularia Groenlandica has a very long stem, which is terminated at the summit only…

"The species shown in this figure has a simple, cylindrical body, without branchiae, and a rudimentary polypidom furnished with very large polyps of a whitish color."

Veretillum Cynomorium (Lamarck)

"The species shown in this figure has a simple, cylindrical body, without branchiae, and a rudimentary…

"The uppermost figure in the illustration shows the Argonaut in the act of swimming. The extremity of the siphon is seen projecting immediately below the eye, and the reader will at once understand that if the action forcibly ejects water from the tube, the effect will be to drive the animal rapidly in the contrary direction; that is, from right to left, as seen in the engraving. The third figure represents an empty shell, and is given for the purpose of showing the partially spiral and deeply grooved keel, as well as the extreme tenuity of the shell itself."

Argonaut, or Paper Nautlius

"The uppermost figure in the illustration shows the Argonaut in the act of swimming. The extremity of…

"The <em>Crinoidea</em>, which belong to the family of starfishes, are mostly attached to marine rocks by a sort of root. Another division of this family, although at first fixed to some rooted stem, in their adult state they throw off the bonds and move freely, swimming through the water water or clinging to mussel or oyster banks."

Pentacrinus Europaeus (Thompson)

"The Crinoidea, which belong to the family of starfishes, are mostly attached to marine rocks…

While not exceptionally high, the Niagara Falls are very wide. More than six million cubic feet (168,000 m³) of water falls over the crest line every minute in high flow,[1] and almost 4 million cubic feet (110,000 m³) on average.

Niagara Falls (American Side), from Goat Island

While not exceptionally high, the Niagara Falls are very wide. More than six million cubic feet (168,000…

A geyser is a hot spring characterized by intermittent discharge of water ejected turbulently and accomplished by a vapour phase.

Giantess Geyser, Yellowstone Park

A geyser is a hot spring characterized by intermittent discharge of water ejected turbulently and accomplished…

The Rhine Falls (Rheinfall in Switzerland) are the largest plain waterfalls of Europe. They are 150 m (450 ft) wide and 23 m (75 ft) high. In the winter months, the average water flow is 250 m³/s, while in the summer, the average water flow is 700 m³/s. The highest flow ever measured was 1,250 m³/s in 1965; and the lowest, 95 m³/s in 1921.

Falls of the Rhine, Schaffhausen

The Rhine Falls (Rheinfall in Switzerland) are the largest plain waterfalls of Europe. They are 150…

Toccoa Falls waterfall is located on the campus of Toccoa Falls College in Stephens County, Georgia. Toccoa is the Cherokee Indian name for "beautiful."

Toccoa Falls

Toccoa Falls waterfall is located on the campus of Toccoa Falls College in Stephens County, Georgia.…

The suction-pump consists of a clindrical pump-barrel traversed by a piston, and communicating by means of a suction-tube with the water in the pump-well.

Suction-pump

The suction-pump consists of a clindrical pump-barrel traversed by a piston, and communicating by means…

An illustration of Horse Shoe and Birmingham Falls.

Waterfall

An illustration of Horse Shoe and Birmingham Falls.

A suction-pump with the upward and downward movement of the piston being effected by means of a lever.

Suction-pump

A suction-pump with the upward and downward movement of the piston being effected by means of a lever.

A suction-pump in which the alternate motion of the piston is effected by means of a rotary motion.

Suction-pump

A suction-pump in which the alternate motion of the piston is effected by means of a rotary motion.

The forcing pump consists of a pump-barrel dipping into water, and having at the bottom a valve opening upward.

Forcing-pump

The forcing pump consists of a pump-barrel dipping into water, and having at the bottom a valve opening…

The ordinary fire-engine is formed by the union of two forcing-pumps which play into a common reservoir, containing in its upper portion air compressed by the working of the engine.

Fire engine pump

The ordinary fire-engine is formed by the union of two forcing-pumps which play into a common reservoir,…

This figure represents a small centrifugal pump as mounted for use. The largest class of centrifugal pumps are usually immersed in the water to be pumped, and revolve horizontally.

Centrifugal pump

This figure represents a small centrifugal pump as mounted for use. The largest class of centrifugal…

As you pour water into a Cup of Tantalus, the cup fills with water, but after it reaches a certain height, the water begins to drain through the siphon.

Vase of Tantalus

As you pour water into a Cup of Tantalus, the cup fills with water, but after it reaches a certain height,…

This is an apparatus employed to obtain a uniform flow of water. The device provides a constant pressure delivering a constant rate of flow.

Mariotte's Bottle

This is an apparatus employed to obtain a uniform flow of water. The device provides a constant pressure…

"1. Locusta of Corynephorus canescens (Grey Hair-grass); 2. paleae, &c. of the same; 3. locusta of Phalaris aquatica (Harding grass); 4. locusta of Alopecurus pratensis (Meadow Foxtail); 5. locusta of Aira caryophyllea (Silver hairgrass); 6. floret of the same; 7. locusta of Festuca duriuscula (Red Fescue); 8. locust of Glyceria fluitans (Water Mannagrass); 9. floret of the same; 10. locusta of Eragrostis poaeformis (Lovegrass)." -Lindley, 1853

Grass Locusta

"1. Locusta of Corynephorus canescens (Grey Hair-grass); 2. paleae, &c. of the same; 3. locusta of Phalaris…

"Pistia Stratiotes. 1. A spathe with its 2 flowers; 2. a section of a seed-vessel; 3. a seed; 4. the same cut perpendicularly." -Lindley, 1853

Water Cabbage

"Pistia Stratiotes. 1. A spathe with its 2 flowers; 2. a section of a seed-vessel; 3. a seed; 4. the…

"Stratiotes aloides. 1. a flower and spathe; 2. a flower split open; 3. a fruit in its spathe; 4. a section of the fruit; 5. an embryo." -Lindley, 1853

Water Pineapple

"Stratiotes aloides. 1. a flower and spathe; 2. a flower split open; 3. a fruit in its spathe; 4. a…

"Eichhornia speciosa; 1. pistil; 2. transverse section of the ovary." -Lindley, 1853

Water Hyacinth

"Eichhornia speciosa; 1. pistil; 2. transverse section of the ovary." -Lindley, 1853

Group of animals gathered at a water trough.

Animals

Group of animals gathered at a water trough.

Man selling water to woman in window.

Man Selling Water

Man selling water to woman in window.

This image depicts a market in front of The Aqueduct of Segovia, located in Segovia, Spain. It was built by the Romans to provide water to the city from the Frio River.

Aqueduct

This image depicts a market in front of The Aqueduct of Segovia, located in Segovia, Spain. It was built…

"Nymphaea coerulea. 1. a perpendicular section of a seed of N. alba; 2. half an embryo, showing the great plumule lying in the cavity of one cotyledon." -Lindley, 1853

Egyptian Blue Lily

"Nymphaea coerulea. 1. a perpendicular section of a seed of N. alba; 2. half an embryo, showing the…

"Nelumbium speciosum. 1. a section of its young carpel; 2. a section of the same when ripened into a bean, and showing the structure of the seed." -Lindley, 1853

Lotus

"Nelumbium speciosum. 1. a section of its young carpel; 2. a section of the same when ripened into a…

An illustration of a man carrying water to his wagon.

Man and Wagon

An illustration of a man carrying water to his wagon.

An illustration of a submerged town on the Mississippi River.

Submerged Town on Mississippi River

An illustration of a submerged town on the Mississippi River.

An view of Hot Springs, Arkansas which is nestled in a valley between two mountains. Hot Springs is traditionally known for the natural spring water that gives it its name, flowing out of the ground at a temperature of 147 degrees Fahrenheit. Also is the home town of former President Bill Clinton.

Hot Springs, Arkanasas

An view of Hot Springs, Arkansas which is nestled in a valley between two mountains. Hot Springs is…

Magna Carta Island is an island in the River Thames in England, on the reach above Bell Weir Lock. It is in Berkshire (formerly Buckinghamshire) across the river from the water-meadows at Runnymede. The island is one of several contenders for being the place where, in 1215, King John sealed the Magna Carta. Whilst the charter itself indicates Runnymede by name, it is possible the island may have been considered part of Runnymede at the time. It is known that in 1217 the island was the meeting-place of Henry III and Louis (afterwards Louis VIII) of France.

Magna Charta Island

Magna Carta Island is an island in the River Thames in England, on the reach above Bell Weir Lock. It…

An illustration of a duck floating on water.

Duck

An illustration of a duck floating on water.

An illustration of a small girl water flowers in a large garden.

Girl Watering Flowers

An illustration of a small girl water flowers in a large garden.

An illustration of a mother washing a child's face while the child plays in the bowl of water.

Mother Washing Child

An illustration of a mother washing a child's face while the child plays in the bowl of water.

A drawing of the port of Buffalo, New York in 1813.

The Port of Buffalo in 1813

A drawing of the port of Buffalo, New York in 1813.

An illustration of a small town with a boat tied up to a dock.

Town

An illustration of a small town with a boat tied up to a dock.

An illustration of a dry dock, a narrow basin or vessel that can be flooded to allow a load to be floated in, then drained to allow that load to come to rest on a dry platform. Dry docks are used for the construction, maintenance, and repair of ships, boats, and other water craft.

Dry Dock

An illustration of a dry dock, a narrow basin or vessel that can be flooded to allow a load to be floated…