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"A term etymologically applicable to any very small animal, and limited in actual use to those which are microscopical. Animalcules exist in prodigious numbers, and of many different kinds, their size being such that multitudes of them find ample space for all the movements of an active life within a single drop of water; and they abound almost wherever there is moisture, at least wherever organic matter is present." — Chambers' Encyclopedia, 1875

Animalcule

"A term etymologically applicable to any very small animal, and limited in actual use to those which…

"These animals [the Rotifera], called <em>Wheel Animalcules</em>, were formerly included among the Infusoria, but are now classed with the Articulata: they are chiefly known to us by the microscope, the largest being not over a tenth of an inch long, and many of them only one three-hundredth of an inch." &mdash; Goodrich, 1859

Wheel, animalcule

"These animals [the Rotifera], called Wheel Animalcules, were formerly included among the Infusoria,…

The point of the finest cambric needle, with a particle of dust (above) and bacteria (below) for scale.

bacteria and cambric needle

The point of the finest cambric needle, with a particle of dust (above) and bacteria (below) for scale.

"A, columnar cells of intestine; B, polyhedral cells of the conjuctiva; C, ciliated conical cells of the trachea; D, ciliated cell of frog's mothl E, inverted conical cell of the trachea; F, squamous cell of the cavity of the mouth, seen on its broad surface; G, squamous cell, seen edgeways." &mdash; Blaisedell, 1904

Various kinds of epithelial cells

"A, columnar cells of intestine; B, polyhedral cells of the conjuctiva; C, ciliated conical cells of…

"One of the simplest of the tissues in the body is called the <em>epithelium</em>, and its cells are called epithelial cells. It serves as a lining of various cavities, a covering for the surface of the body, and the essential part of various organs called glands." — Blaisedell, 1904

Cross-Section of the Epithelium

"One of the simplest of the tissues in the body is called the epithelium, and its cells are…

A small group of fairly uniform animals which live among Rotifers and Protozoa at the bottom of ponds and marshes.

Gastrotricha

A small group of fairly uniform animals which live among Rotifers and Protozoa at the bottom of ponds…

Grovia Oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost always marine in distribution and typically have limy shells.

Grovia Oviformis

Grovia Oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost…

"Consisting of a very fine network of fibrils, around which are cells of various sizes." — Blaisedell, 1904

Connective Tissue from a Lymphatic Gland

"Consisting of a very fine network of fibrils, around which are cells of various sizes." — Blaisedell,…

<i>Grovia oviformis</i> is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost always marine in distribution and typically have limy shells.

Nummulites Cummingii

Grovia oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost…

Grovia Oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost always marine in distribution and typically have limy shells.

Polystomella Strigillata

Grovia Oviformis is a type of Foraminifera (a class of unicellular animal/protozoa). They are almost…

"Along with white fibrous tissue, the yellow fibrous tissue... makes the coats of the arteries, and certain ligaments, elastic." &mdash; Blaisedell, 1904

Yellow elastic tissue

"Along with white fibrous tissue, the yellow fibrous tissue... makes the coats of the arteries, and…