ClipArt ETC
Top of a leaf, cut across; it consists of a single layer of cells.

Leaf

Top of a leaf, cut across; it consists of a single layer of cells.

Mnium cuspidatum plant

Mnium

Mnium cuspidatum plant

Mnium cuspidatum's calyptra detached

Mnium

Mnium cuspidatum's calyptra detached

Mnium cuspidatum's spore-case, with top of stalk.

Mnium

Mnium cuspidatum's spore-case, with top of stalk.

Mnium cuspidatum's spore-case, with top of stalk, focusing on the lid and outside of the peristome.

Mnium

Mnium cuspidatum's spore-case, with top of stalk, focusing on the lid and outside of the peristome.

Mnium cuspidatum's part of a cellular ring which was under the lid, outside of the peristome.

Mnium

Mnium cuspidatum's part of a cellular ring which was under the lid, outside of the peristome.

Mnium cuspidatum, some of the outer and of the inner peristome (consisting of jointed teeth).

Mnium

Mnium cuspidatum, some of the outer and of the inner peristome (consisting of jointed teeth).

Antheridia and a pistillidium of the Mnium cuspidatum, at the end of a stem of same plant, the leaves torn away.

Mnium

Antheridia and a pistillidium of the Mnium cuspidatum, at the end of a stem of same plant, the leaves…

A bursting antheridium, and some of the accompanying jointed threads.

Mnium

A bursting antheridium, and some of the accompanying jointed threads.

Summit of an open spore-case of a Moss, which has a peristome of 16 pairs of teeth.

Moss

Summit of an open spore-case of a Moss, which has a peristome of 16 pairs of teeth.

The double peristome of a Hypnum.

Hypnum

The double peristome of a Hypnum.

Spore-case of a Physcomitrium Pyriforme.

Physcomitrium Pyriforme

Spore-case of a Physcomitrium Pyriforme.

Detached calyptra of a Physcomitrium Pyriforme.

Physcomitrium Pyriforme

Detached calyptra of a Physcomitrium Pyriforme.

Spore-case and detached lid of a Physcomitrium Pyriforme.

Physcomitrium Pyriforme

Spore-case and detached lid of a Physcomitrium Pyriforme.

One of the frondose Liverworts, Steetzia, otherwise like a Jungermannia; the spore-case not yet protruded from its sheath.

Liverworts

One of the frondose Liverworts, Steetzia, otherwise like a Jungermannia; the spore-case not yet protruded…

Plant of Riccia natans

Riccia

Plant of Riccia natans

Plant of Riccia natans

Riccia

Plant of Riccia natans

Section of a part of the front, showing two immersed spore-cases, and one emptied space.

Riccia

Section of a part of the front, showing two immersed spore-cases, and one emptied space.

Spore-case torn out, and spores; one figure of the spores united; the other of the four separated.

Riccia

Spore-case torn out, and spores; one figure of the spores united; the other of the four separated.

Branch of a Chara

Chara

Branch of a Chara

Outlines of a portion of the stem in section, showing the central cell and the outer or cortical cells.

Chara

Outlines of a portion of the stem in section, showing the central cell and the outer or cortical cells.

A piece of the rose-red Delesseria Lepreiurei

Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei, showing that it is composed of a layer of cells.

Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei, showing that it is composed of a layer of cells.

A piece of the rose-red Delesseria Lepreiurei, showing the cells are gelatinous and thick-walled.

Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei, showing the cells are gelatinous and thick-walled.

Closterium acutum, a common Desmid. It is a single firm-walled cell, filled with green protoplasmic matter.

Desmid

Closterium acutum, a common Desmid. It is a single firm-walled cell, filled with green protoplasmic…

View of three stages of the conjugation

Desmid

View of three stages of the conjugation

Stage of a species of Botrydium, a globose cell.

Botrydium

Stage of a species of Botrydium, a globose cell.

Full-grown plant, extended and ramified below in a root-like way.

Botrydium

Full-grown plant, extended and ramified below in a root-like way.

A Vaucheria; single cell grown on into a much-branched thread; the end of some branches enlarging, and the green contents in one (a) there condensed into a spore.

Vaucheria

A Vaucheria; single cell grown on into a much-branched thread; the end of some branches enlarging, and…

A Vaucheria; spore and the mature spore escaping.

Vaucheria

A Vaucheria; spore and the mature spore escaping.

Bryopsis plumosa; apex of a stem with its branchlets; all the extension of one cell.

Bryopsis Plumosa

Bryopsis plumosa; apex of a stem with its branchlets; all the extension of one cell.

A stone on which various Lichens are growing, such as (passing from left to right) a Parmelia, a Sticta, and on the right, Lecidia geographica, so called from its patches resembling the outline of islands or continents as depicted upon maps.

Lichens

A stone on which various Lichens are growing, such as (passing from left to right) a Parmelia, a Sticta,…

Piece of thallus of Parmelia conspersa, with section through an apothecium.

Parmelia

Piece of thallus of Parmelia conspersa, with section through an apothecium.

Section of a smaller apothecium.

Apothecium

Section of a smaller apothecium.

Two asci of the same, and contained spores, and accompanying filaments.

Lichens

Two asci of the same, and contained spores, and accompanying filaments.

Piece of thallus of a Sticta, with section, showing the immersed apothecia; the small openings of these dot the surface.

Sticta

Piece of thallus of a Sticta, with section, showing the immersed apothecia; the small openings of these…

Cladonia coccinea; the fructification is in the scarlet knobs, which surround the cups.

Cladonia

Cladonia coccinea; the fructification is in the scarlet knobs, which surround the cups.

Two of the asci and contained double spores, quite like those of a Lichen

Lichen

Two of the asci and contained double spores, quite like those of a Lichen

A species of Botrytis.

Botrytis

A species of Botrytis.

A grape-vine leaf gall-louse. The insect forms galls on the under side of the grape-vine leaves, and although they appear to do comparatively little injury to the vine, they are extremely interesting to vine-growers.

Fitch

A grape-vine leaf gall-louse. The insect forms galls on the under side of the grape-vine leaves, and…

Phylloxera Vastatrix, a grape-vine-root gall-louse, is by many entomologists supposed to be another form of the Pemphigus vitifoliae above mentioned, but that, instead of living above ground and forming hollow bag-like galls on the leaves, it lives under-ground on the roots, upon which it forms knotty swellings or galls.

Grape-Root Louse

Phylloxera Vastatrix, a grape-vine-root gall-louse, is by many entomologists supposed to be another…

Cysts on a living rose leaf.

Cysts

Cysts on a living rose leaf.

Cysts on a living rose leaf.

Cysts

Cysts on a living rose leaf.

Cysts on a living rose leaf, sectional view.

Cysts

Cysts on a living rose leaf, sectional view.

Spores and cysts on a living rose leaf.

Cysts

Spores and cysts on a living rose leaf.

An image of spores.

Spores

An image of spores.

The Southern Katydid, Microcentrum laurifolium- 1, the female adult; 1a, eggs laid on leaves and twigs of orange; 1b, the young katydids; 2b, parasites on the eggs.

Katydid

The Southern Katydid, Microcentrum laurifolium- 1, the female adult; 1a, eggs laid on leaves and twigs…

Lecanium Hemisphericum on orange-leaves; a, female scale.

Lecanium Hemisphericum

Lecanium Hemisphericum on orange-leaves; a, female scale.

Elm-leaf beetle, Galeruca xanthomelaena; a, egg patches on leaves; b, larva feeding; c, adult feeding.

Beetle

Elm-leaf beetle, Galeruca xanthomelaena; a, egg patches on leaves; b, larva feeding; c, adult feeding.

A squirrel hiding in a tree from the rain.

Squirrel

A squirrel hiding in a tree from the rain.

Currant-worm, <em>a</em>male and female adult and <em>b</em>larvae.

Currant Worm

Currant-worm, amale and female adult and blarvae.

A leaf-cutter bee, Megachile species. Segments of leaves cut from leaf-cutter bee.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Segments of leaves cut from leaf-cutter bee.

A leaf-cutter bee, Megachile species. Leaves cut from leaf-cutter bee in a burrow in a dead branch.

Leaf-Cutter Bee

A leaf-cutter bee, Megachile species. Leaves cut from leaf-cutter bee in a burrow in a dead branch.

Camelia sinensis is the tea plant, the plant species whose leaves and leaf buds are used to produce tea.

Tea

Camelia sinensis is the tea plant, the plant species whose leaves and leaf buds are used to produce…

Upper end of stem, showing leaves of asparagus.

Asparagus

Upper end of stem, showing leaves of asparagus.

"The common sorrel is a meadow plant, slender in habit, with halberd-shaped, juicy, acid flavored leaves, and bearing whorled spikes of greenish-red flowers in summer."&mdash;Finley, 1917

Sorrel

"The common sorrel is a meadow plant, slender in habit, with halberd-shaped, juicy, acid flavored leaves,…

"The common spindle tree (<em>Euonymus europaeus</em>) is a European shrub, which bears glossy lanceolate leaves, and in late spring clusters of small greenish flowers, followed by fruits which become beautifully rose colored."—Finley, 1917

Spindle Tree

"The common spindle tree (Euonymus europaeus) is a European shrub, which bears glossy lanceolate…

"The European hedge woundwort, a tall hairy plant, with heart-shaped leaves, and numerous whorls of full purple flowers, usually six in a whorl."

Stackys sylvatica

"The European hedge woundwort, a tall hairy plant, with heart-shaped leaves, and numerous whorls of…

Plan of the blood vessels connected with the tubules. "The blood passes downwards in straight vessels between the uriniferous tubules, to be returned by more or less straight veins to the venous arches, whence it is conveyed by large branches into the renal vein, which leaves the kidney at the hilus and pours its contents into the inferior vena cava... Urine is secreted from the blood in two ways. It is partly removed by a process of transudation or filtration, and partly by the secretary action of the cells lining the uriniferous tubules." &mdash;Kimber, 1907.

Plan of the Blood Vessels Connected with the Tubules

Plan of the blood vessels connected with the tubules. "The blood passes downwards in straight vessels…

"Experiment to illustrate electrostatic induction. The leaves will diverge, ever though the charged ebonite rod does not approach to within a foot of the electroscope." -Hawkins, 1917

Electrostatic Induction

"Experiment to illustrate electrostatic induction. The leaves will diverge, ever though the charged…