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"An order of the class Infusoria, the adult members of which have no cilia and no proper mouth, and are non-locomotive." -Whitney, 1902

Acinetæ

"An order of the class Infusoria, the adult members of which have no cilia and no proper mouth, and…

A member of the primulaceae which is a native plant to Pyrenees.

Soldanella Alpina

A member of the primulaceae which is a native plant to Pyrenees.

Amoeboids are unicellular life-forms characterized by their similarity to amoebas.

Amoeboid

Amoeboids are unicellular life-forms characterized by their similarity to amoebas.

"They are trumpet-animalcules of the family Stentoridae, with the peristome divided into two lappet-like parts. Folliculina ampulla is an example." -Whitney, 1911

Trumpet Animalcule

"They are trumpet-animalcules of the family Stentoridae, with the peristome divided into two lappet-like…

This perennial is of the sempervivum family; featuring furry central rosettes.

Sempervivum Arachnoideum

This perennial is of the sempervivum family; featuring furry central rosettes.

"Bacilli mingles with blood-corpuscles from the blood of a guinea-pig; some of the bacilli dividing." — The Encyclopedia Britannica, 1910

Bacillus Anthracis

"Bacilli mingles with blood-corpuscles from the blood of a guinea-pig; some of the bacilli dividing."…

"The rodlets after three hours' culture in a drop of aqueous humour. They grow out into long leptothrix-like filaments, which become septate later, and spores are developed in the segments." — The Encyclopedia Britannica, 1910

Bacillus Anthracis

"The rodlets after three hours' culture in a drop of aqueous humour. They grow out into long leptothrix-like…

"A pair of bacilli actively growing and dividing." — The Encyclopedia Britannica, 1910

Bacillus Megaterium

"A pair of bacilli actively growing and dividing." — The Encyclopedia Britannica, 1910

"A rodlet in this condition (but divided into four segments) after treatment with alcoholic iodine solution." — The Encyclopedia Britannica, 1910

Bacillus Megaterium

"A rodlet in this condition (but divided into four segments) after treatment with alcoholic iodine solution."…

"Successive stages in the development of the spores." — The Encyclopedia Britannica, 1910

Bacillus Megaterium

"Successive stages in the development of the spores." — The Encyclopedia Britannica, 1910

"A rodlet segmented in four, each segment containing one ripe spore." — The Encyclopedia Britannica, 1910

Bacillus Megaterium

"A rodlet segmented in four, each segment containing one ripe spore." — The Encyclopedia Britannica,…

"Early stages in the germination of the spores (after being dried several days)." — The Encyclopedia Britannica, 1910

Bacillus Megaterium

"Early stages in the germination of the spores (after being dried several days)." — The Encyclopedia…

"Successive stages in the germination of the spore." — The Encyclopedia Britannica, 1910

Bacillus Megaterium

"Successive stages in the germination of the spore." — The Encyclopedia Britannica, 1910

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops under very high powers. The spore sown at 11 A.M., as shown at a, had swollen (b) perceptibly by noon, and had germinated by 3:30 P.M., as shown at c: in d at 6 P.M., and e at 8:30 P.M.; the resulting filament is segmenting into bacilli as it elongates, and at midnight (f) consisted of twelve such segments." — The Encyclopedia Britannica, 1910

Bacillus Ramosus

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops…

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops under very high powers. Similar series of phases in the order of the small letters in each case, and with the times of observation attached. At f and g occurs the breaking up of the filament into rodlets." — The Encyclopedia Britannica, 1910

Bacillus Ramosus

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops…

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops under very high powers. Similar series of phases in the order of the small letters in each case, and with the times of observation attached. At f and g occurs the breaking up of the filament into rodlets." — The Encyclopedia Britannica, 1910

Bacillus Ramosus

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops…

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops under very high powers. Germinating spores in various stages, more highly magnified, and showing the different ways of escape of the filament from the spore-membrane." — The Encyclopedia Britannica, 1910

Bacillus Ramosus

"The various phases of germination of spores of Bacillus ramosus, as actually observed in hanging drops…

"Bacillus subtilis, Cohn, and Spirillum undula, Ehrenb." — The Encyclopedia Britannica, 1910

Bacillus Subtilis

"Bacillus subtilis, Cohn, and Spirillum undula, Ehrenb." — The Encyclopedia Britannica, 1910

"Bacillus Typhi, Gaffky." — The Encyclopedia Britannica, 1910

Bacillus Typhi

"Bacillus Typhi, Gaffky." — The Encyclopedia Britannica, 1910

"Bacillus Vulgaris, Migula." — The Encyclopedia Britannica, 1910

Bacillus Vulgaris

"Bacillus Vulgaris, Migula." — The Encyclopedia Britannica, 1910

"A colony of Cercomonas termo, a typical flagellate infusorian." -Whitney, 1911

Cercomonad Flagellate

"A colony of Cercomonas termo, a typical flagellate infusorian." -Whitney, 1911

"Clostridium—one cell contains two spores." — The Encyclopedia Britannica, 1910

Clostridium

"Clostridium—one cell contains two spores." — The Encyclopedia Britannica, 1910

"Germination of spore of Clostridium butyricum—the axis of growth coincides with the long axis of the spore." — The Encyclopedia Britannica, 1910

Clostridium

"Germination of spore of Clostridium butyricum—the axis of growth coincides with the long axis…

"A chair of cocci of Leuconostoc mesenterioides, with two "resting spores," i.e. anthrospores." — The Encyclopedia Britannica, 1910

Cocci

"A chair of cocci of Leuconostoc mesenterioides, with two "resting spores," i.e. anthrospores." —…

This plant is edible; belonging to the cucurbitaceae.

Sechium Edule

This plant is edible; belonging to the cucurbitaceae.

"Diagrams of Foraminifera. A, monothalamian; B, C, polythalamian; D, horizontal, and E, F, vertical sections of the helicoid forms." -Whitney, 1911

Diagrams of Foraminifera

"Diagrams of Foraminifera. A, monothalamian; B, C, polythalamian; D, horizontal, and E, F, vertical…

"Globigerina bulloides. GLOBIGERINIDAE. A family of chiefly pelagic foraminiferous rhizopods, with the perforate test free and calcareous, its several chambers inflated or globose and arranged in a turbinate spiral, the aperture simple or multiple and conspicuous, opening into an umbilical depression, and no supplementary skeleton or canal system." -Whitney, 1911

Globigerina

"Globigerina bulloides. GLOBIGERINIDAE. A family of chiefly pelagic foraminiferous rhizopods, with the…

"Globigerina bulloides. GLOBIGERINIDAE. A family of chiefly pelagic foraminiferous rhizopods, with the perforate test free and calcareous, its several chambers inflated or globose and arranged in a turbinate spiral, the aperture simple or multiple and conspicuous, opening into an umbilical depression, and no supplementary skeleton or canal system." -Whitney, 1911

Globigerina

"Globigerina bulloides. GLOBIGERINIDAE. A family of chiefly pelagic foraminiferous rhizopods, with the…

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of…

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of…

"Gregarina, free pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina

"Gregarina, free pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans,…

"Gregarina of Earthworm, encysted. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina Encysted

"Gregarina of Earthworm, encysted. GREGARINIDAE. A family or other major group of endoplastic protozoans,…

"Gregarina of Earthworm. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina of Earthworm

"Gregarina of Earthworm. GREGARINIDAE. A family or other major group of endoplastic protozoans, having…

"Gregarina, their free amoebiform contents. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Amoebiform Gregarina

"Gregarina, their free amoebiform contents. GREGARINIDAE. A family or other major group of endoplastic…

"Microspira Comma, Schroeter." — The Encyclopedia Britannica, 1910

Microspira Comma

"Microspira Comma, Schroeter." — The Encyclopedia Britannica, 1910

"Colonies of Myconostoc enveoped in diffluent matrix." — The Encyclopedia Britannica, 1910

Myconostoc

"Colonies of Myconostoc enveoped in diffluent matrix." — The Encyclopedia Britannica, 1910

"Colonies of Myconostoc enveoped in diffluent matrix." — The Encyclopedia Britannica, 1910

Myconostoc

"Colonies of Myconostoc enveoped in diffluent matrix." — The Encyclopedia Britannica, 1910

"Colonies of Myconostoc enveoped in diffluent matrix." — The Encyclopedia Britannica, 1910

Myconostoc

"Colonies of Myconostoc enveoped in diffluent matrix." — The Encyclopedia Britannica, 1910

<i>Sipunculus nudus</i>. A species of unsegmented marine worm, commonly called the peanut worm. "A, One fourth natural size, in longitudinal section. T, tentacles; r,r,r,r, four retractor muscles of the proboscis, detached from the points r1, r1 in the body walls; a, anus; ae, esophagus; i, intestine with j1, j2 its loops; x, y, appendages of rectum; z, fusiform mscle; w, ciliated groove of intestine; q, anal muscles; s, caecal glands of t, caeca, the so-called testes; p, pore at end of body; n, nervous cord, ending in a lobed ganglionic mass near the mouth, with an enlargement, g1, posteriorly; m1, m2, muscles associated with the nervous cord." &mdash;Whitney, 1889

Peanut Worm - Interior Anatomy of Adult

Sipunculus nudus. A species of unsegmented marine worm, commonly called the peanut worm. "A, One fourth…

This perennial belongs to scillia; widely seen in Mediterranean regions.

Scilla Peruviana

This perennial belongs to scillia; widely seen in Mediterranean regions.

"Planococcus citreus (Menge), Migula." &mdash; The Encyclopedia Britannica, 1910

Planococcus Citreus

"Planococcus citreus (Menge), Migula." — The Encyclopedia Britannica, 1910

This plant is usually bright red and commonly seen in western parts of North America.

Snow Plant

This plant is usually bright red and commonly seen in western parts of North America.

"Pseudomonas Macroselmis, Migula." &mdash; The Encyclopedia Britannica, 1910

Pseudomonas Macroselmis

"Pseudomonas Macroselmis, Migula." — The Encyclopedia Britannica, 1910

"Pseudomonas pyocyanea" &mdash; The Encyclopedia Britannica, 1910

Pseudomonas Pyocyanea

"Pseudomonas pyocyanea" — The Encyclopedia Britannica, 1910

"Pseudomonas Syncyanea, Migula." &mdash; The Encyclopedia Britannica, 1910

Pseudomonas Syncyanea

"Pseudomonas Syncyanea, Migula." — The Encyclopedia Britannica, 1910

This flowering plant belongs to the ruscaceae, which are common in North America.

Smilacina Racemosa

This flowering plant belongs to the ruscaceae, which are common in North America.

"A motile rodlet with one cilium and with a spore formed inside." &mdash; The Encyclopedia Britannica, 1910

Rodlet

"A motile rodlet with one cilium and with a spore formed inside." — The Encyclopedia Britannica,…

A rotifer or wheel animalcule (Floscularia ornata) is a microscopic animal named for the cilia used in motion.

Rotifer

A rotifer or wheel animalcule (Floscularia ornata) is a microscopic animal named for the cilia used…

The rotifers or wheel-animalcules are relatively small and beautiful organisms, rarely ever longer that a third of an inch. The rotifers make up a phylum of microscopic and near-microscopic pseudocoelomate animals. At first sight they they might be mistaken for one-celled animals, but the presence of a digestive tract and of reproductive elements soon dispels such a belief.

Rotifers

The rotifers or wheel-animalcules are relatively small and beautiful organisms, rarely ever longer that…

The phylum Sarcomastigophora belongs to the Protist kingdom and it includes many unicellular or colonial, autotrophic, or heterotrophic organisms. The two main subphyla are Mastigophora and Sarcodina. A third is Opalinata.

Sarcomastigophora

The phylum Sarcomastigophora belongs to the Protist kingdom and it includes many unicellular or colonial,…

This perennial herb mainly survives in the cold climate of the arctic.

Garden Saxifragas

This perennial herb mainly survives in the cold climate of the arctic.

"Spore-formation in Vibrio-like (c) and Spirillum-like (a, b, d) Schizomycetes." &mdash; The Encyclopedia Britannica, 1910

Schizomycetes

"Spore-formation in Vibrio-like (c) and Spirillum-like (a, b, d) Schizomycetes." — The Encyclopedia…

This plant belongs to the scillia showing leaves that are usually pink and blue.

Bifolia Scilla

This plant belongs to the scillia showing leaves that are usually pink and blue.

This perennial belongs to the sedoldeae.

Pilosum Sedum

This perennial belongs to the sedoldeae.

Plant which belongs to the sedum family.

Plant of Sedum

Plant which belongs to the sedum family.

A bulb like perennial commonly seen in Siberia.

Scilla Siberica

A bulb like perennial commonly seen in Siberia.

"Spirillum containing many spores (a), which are liberated at b by the breaking up of the parent cells." &mdash; The Encyclopedia Britannica, 1910

Spirillum

"Spirillum containing many spores (a), which are liberated at b by the breaking up of the parent cells."…

"Spirillum Rubrum, Esmarsch." &mdash; The Encyclopedia Britannica, 1910

Spirillum Rubrum

"Spirillum Rubrum, Esmarsch." — The Encyclopedia Britannica, 1910

"Spirillum Rubrum, Esmarsch." &mdash; The Encyclopedia Britannica, 1910

Spirillum Rubrum

"Spirillum Rubrum, Esmarsch." — The Encyclopedia Britannica, 1910

"Spirillum Undula, Ehrunb." &mdash; The Encyclopedia Britannica, 1910

Spirillum Undula

"Spirillum Undula, Ehrunb." — The Encyclopedia Britannica, 1910