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In this image, (a) represents the parasites in the various stages of development, and (b), the larger animalcule on which they have established themselves.

Paramecium Aurelia and its Parasites

In this image, (a) represents the parasites in the various stages of development, and (b), the larger…

"The singular phenomenon of spontaneous division may be witnessed by any one having patience to examine the creature long enough under the microscope, isolated from its innumerable companions. This process is represented here, A and B being the adult, C the same in course of separation, D after its completion."

Propagation of an Infusorian by Spontaneous Division

"The singular phenomenon of spontaneous division may be witnessed by any one having patience to examine…

"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…