ClipArt ETC
"The principle of increased velocity as bodies descend from a height, is curiously illustrated by pouring molasses or thick syrup from an elevation to the ground. The bulky stream, of perhaps two inches in diameter where it leaves the vessel, as it descends, is reduced to the size of a straw, or knitting-needle; but what it wants in bulk is made up in velocity, for the small stream at the ground will fill a vessel just as soon as the large one at the outlet." —Comstock, 1850

Increased Velocity

"The principle of increased velocity as bodies descend from a height, is curiously illustrated by pouring…

A high branched flower whoes petal consist of longspiny leaves. Usually bright yellow, orange or red.

Safflower

A high branched flower whoes petal consist of longspiny leaves. Usually bright yellow, orange or red.

A leaf shaped like a triangle.

Sagittate Leaf

A leaf shaped like a triangle.

A symmetrical plant with many dark green leaves on a hair trunk.

Sago Palm

A symmetrical plant with many dark green leaves on a hair trunk.

"When the moon psses between the Earth and Sun, there happens an eclipse of the Sun, because then the Moon's shadow falls upon the Earth. A total eclipse of the Sun happens often, but when it occurs, the total obscurity is confined to a small part of the Earth; since the dark portion of the Moon's shadow never exceeds 200 miles in diameter on the Earth. But the Moon's partial shadow, or penumbra, may cover a space on the Earth of more than 4,000 miles in diameter, within all which space the Sun will be more or less eclipsed. When the penumbra first touches the Earth, the eclipse begins at that place, and ends when the penumbra leaves it. But the eclipse will be total only where the dark shadow of the Moon touches the earth." —Comstock, 1850

Sun Eclipse

"When the moon psses between the Earth and Sun, there happens an eclipse of the Sun, because then the…

Leaf motif

Doodad

Leaf motif

Lantern-flies may be found on the under side of leaves of various plants, particularly grape, sucking the juices, preferably from the larger veins or ribs.

Lantern Fly

Lantern-flies may be found on the under side of leaves of various plants, particularly grape, sucking…

Lantern-flies may be found on the under side of leaves of various plants, particularly grape, sucking the juices, preferably from the larger veins or ribs.

Lantern Fly

Lantern-flies may be found on the under side of leaves of various plants, particularly grape, sucking…

A black, very little marked with yellow, and the only satisfactory remedy is cutting out and destroying the larva as soon as its presence is indicated by the wilting leaves.

Blackberry Borer Male

A black, very little marked with yellow, and the only satisfactory remedy is cutting out and destroying…

A black, very little marked with yellow, and the only satisfactory remedy is cutting out and destroying the larva as soon as its presence is indicated by the wilting leaves.

Blackberry Borer Female

A black, very little marked with yellow, and the only satisfactory remedy is cutting out and destroying…

A bread-fruit tree with cuneate-ovate pinnatifid leaves, male flowers in a club-shaped deciduous catkin, and female flowers in rounded clusters.

Bread-Fruit Tree

A bread-fruit tree with cuneate-ovate pinnatifid leaves, male flowers in a club-shaped deciduous catkin,…

Chiloscyphus polyanthos. The perianth with the small perichaetial leaves below it.

Bryophyta

Chiloscyphus polyanthos. The perianth with the small perichaetial leaves below it.

Sphagnum acutifolium. Longitudinal section of apex of a bud bearing archegonia (ar), enclosed by the large leaves (y); ch, small perichaetial leaves

Bryophyta

Sphagnum acutifolium. Longitudinal section of apex of a bud bearing archegonia (ar), enclosed by the…

Sphagnum acutifolium. Ripe sporogonium raised on the pseudopodium above the enclosing leaves

Bryophyta

Sphagnum acutifolium. Ripe sporogonium raised on the pseudopodium above the enclosing leaves

Leaf of Butterwort with left margin inflected over a row of small flies

Butterwort

Leaf of Butterwort with left margin inflected over a row of small flies

Glands from surface of leaf by which the sticky liquid is secreted and by means of which the products of digestion are absorbed

Butterwort

Glands from surface of leaf by which the sticky liquid is secreted and by means of which the products…

Rod wrapped in vines and leaves.

Floral Footer

Rod wrapped in vines and leaves.

A floral footer with vines and leaves

Floral Footer

A floral footer with vines and leaves

Growth of Flax seedling from a stem with two leaves and a bud, to a stem with several leaves and stem joints between leaves.

Early Flax Seedling

Growth of Flax seedling from a stem with two leaves and a bud, to a stem with several leaves and stem…

Seedling with stem joints and pair of leaves.

Red Maple Seedling

Seedling with stem joints and pair of leaves.

Caulicle well lengthened and root beginning; thick cotyledons partly spreading; plumule (pair of leaves) growing between them.

Common Bean Seedling

Caulicle well lengthened and root beginning; thick cotyledons partly spreading; plumule (pair of leaves)…

Caulicle with plumule developed into internodes and pair of leaves.

Large Common Bean Seedling

Caulicle with plumule developed into internodes and pair of leaves.

Older beech with the plumule-leaves developing, and elevated on a long internodes.

Beech-nut Germination Older

Older beech with the plumule-leaves developing, and elevated on a long internodes.

Pea germination: the plumule has developed four or five internodes, bearing single leaves; but the first and second leaves are mere scales, the third begins to serve as foliage; the next more so.

Pea Germination

Pea germination: the plumule has developed four or five internodes, bearing single leaves; but the first…

A genus of plants or shrubs, mostly tropical, two species of which arecharacterized by large white flowers and deeply indented shining leaves.

Acanthus

A genus of plants or shrubs, mostly tropical, two species of which arecharacterized by large white flowers…

Seedling of Morning Glory more advanced (root cut away); cotyledons well developed into foliage-leaves: succeeding internode and leaf well developed, and the next forming.

Morning Glory Seedling

Seedling of Morning Glory more advanced (root cut away); cotyledons well developed into foliage-leaves:…

Spiny leafed trees or shrubs with bipinnate leaves

Acacia

Spiny leafed trees or shrubs with bipinnate leaves

A germinating seedling of the Iris, its plumule developed into the first four leaves (alternate), the first one rudimentary; the cotyledon remains in the seed.

Iris Germinating

A germinating seedling of the Iris, its plumule developed into the first four leaves (alternate), the…

Hairy plants of the legume family with pinnate leaves that produce red or purple flowers.

Indigo

Hairy plants of the legume family with pinnate leaves that produce red or purple flowers.

Shoot of Horse-chestnut, of one year's growth, taken in autumn after the leaves have fallen; showing the large terminal bud and smaller auxiliary buds.

Shoot of Horse-chestnut

Shoot of Horse-chestnut, of one year's growth, taken in autumn after the leaves have fallen; showing…

An auxiliary bud, concealed under the hollowed base of the leafstalk, in Buttonwood or Plane-tree.

Auxiliary Bud

An auxiliary bud, concealed under the hollowed base of the leafstalk, in Buttonwood or Plane-tree.

The investing sheaths or dead leaf-bases striped off. The faint cross-lines represent the scars, where the leaves were attached, i.e. the nodes: the spaces between are the internodes. The exhausted corm of the previous year is underneath; forming ones for next year on the summit and sides.

Corm of a Crocus

The investing sheaths or dead leaf-bases striped off. The faint cross-lines represent the scars, where…

A ground leaf of White Lily, its base (cut across) thickened into a bulb-scale. This plainly shows that bulb-scales are leaves.

White Lily

A ground leaf of White Lily, its base (cut across) thickened into a bulb-scale. This plainly shows that…

Leaf of the Quince: <em>b</em>, blade; <em>p</em>, petiole; <em>st</em>, stipules.

Quince

Leaf of the Quince: b, blade; p, petiole; st, stipules.

From left to right: Linear, Lanceolate, Oblong, Elliptical, Ovate, Cordate.

Feathered-veined leaves

From left to right: Linear, Lanceolate, Oblong, Elliptical, Ovate, Cordate.

From left to right: Oblanceolate, spatulate, obovate, wedge-shape.

Feathered-veined leaves

From left to right: Oblanceolate, spatulate, obovate, wedge-shape.

From left to right: Sagittate, Auriculate, Halbert-shaped.

Feathered-veined leaves 3

From left to right: Sagittate, Auriculate, Halbert-shaped.

From left to right: Various forms of radiatte-veined leaves.

Radiate-Veined

From left to right: Various forms of radiatte-veined leaves.

From left to right: Acuminate, Acute, Obtuse, Truncate, Retuse, Emarginate, Obcordate, Cuspidate, Mucronate.

Apex of Leaves

From left to right: Acuminate, Acute, Obtuse, Truncate, Retuse, Emarginate, Obcordate, Cuspidate, Mucronate.

From left to right: Serrate, Dentate, Crenate, Wavy, Sinuate, Incised.

Kinds of Margin of Leaves

From left to right: Serrate, Dentate, Crenate, Wavy, Sinuate, Incised.

From left to right: pinnately lobed, pinnately cleft, pinnately parted, pinnately divided.

Pinnately Leaves

From left to right: pinnately lobed, pinnately cleft, pinnately parted, pinnately divided.

From left to right: Three Lobed, Three Cleft, Three Parted, Three Divided.

Palmately Leaves

From left to right: Three Lobed, Three Cleft, Three Parted, Three Divided.

From left to right: Pinnate with odd leaflet, Pinnate with a tendril in place, Pinnate with even pairs.

Pinnate Leaves

From left to right: Pinnate with odd leaflet, Pinnate with a tendril in place, Pinnate with even pairs.

Palmate leaf of five leaflets of the Sweet Buckeye.

Palmate Leaf

Palmate leaf of five leaflets of the Sweet Buckeye.

A summer branch of Uvularia perfoliata; upper cordate-clasping, uppermost simply sessile.

Uvularia

A summer branch of Uvularia perfoliata; upper cordate-clasping, uppermost simply sessile.

Branch of a Honeysuckle, with connate-perfoliate leaves.

Honeysuckle Stem

Branch of a Honeysuckle, with connate-perfoliate leaves.

Rootstock and equitant leaves of Iris.

Iris

Rootstock and equitant leaves of Iris.

A section across the cluster of leaves at the bottom, showing the equitation.

Iris cluster

A section across the cluster of leaves at the bottom, showing the equitation.

A young Agave Americana, or Century-plant: Fleshly-leaved.

Century-plant

A young Agave Americana, or Century-plant: Fleshly-leaved.

Series of bud-scales and foliage-leaves from a developing bud of the Low Sweet Buckeye, showing nearly complete gradation, from a scale to a compound leaf of five leaflets; and that the scales answer to reduced petioles.

Low Sweet Buckeye

Series of bud-scales and foliage-leaves from a developing bud of the Low Sweet Buckeye, showing nearly…

Shoot of common Barberry, showing transition of foliage-leaves to spines.

Barberry

Shoot of common Barberry, showing transition of foliage-leaves to spines.

Leaves of Solanum jasminoides, the petiole adapted for climbing.

Solanum Jasminoides

Leaves of Solanum jasminoides, the petiole adapted for climbing.

Leaf of Lathyrus Aphaca, consisting of a pair of stipules and a tendrils.

Lathyrus Aphaca

Leaf of Lathyrus Aphaca, consisting of a pair of stipules and a tendrils.

Leaf of Sarracenia purpurea, entire, and another with the upper part cut off.

Sarracenia Purpurea

Leaf of Sarracenia purpurea, entire, and another with the upper part cut off.

Leaf of Nepenthes; foliage, tendril, and pitcher combined.

Nepenthes

Leaf of Nepenthes; foliage, tendril, and pitcher combined.

Leaves of Dionaea; the trap in one of them open in the others closed.

Dionaea

Leaves of Dionaea; the trap in one of them open in the others closed.

Terminal winter bud of Magnolia Umbrella.

Magnolia Umbrella

Terminal winter bud of Magnolia Umbrella.

Alternate leaves, in Linden, Lime-tree, or Basswood.

Alternate Leaves

Alternate leaves, in Linden, Lime-tree, or Basswood.

Opposite leaves, in Red Maple.

Red Maple

Opposite leaves, in Red Maple.

Whorled leaves of Gallium.

Gallium

Whorled leaves of Gallium.