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"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality, and which are the immediate and active means of impregnating or fertilizing the ovum of the female... I. broadest view; II. profile, of k, kernel or nucleus of the head, and m, filamentous body, ending in s, the long slender tail." —Whitney, 1889

Human Spermatozoa

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality,…

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality, and which are the immediate and active means of impregnating or fertilizing the ovum of the female... I. broadest view; II. profile, of k, kernel or nucleus of the head, and m, filamentous body, ending in s, the long slender tail." &mdash;Whitney, 1889 <p>Illustration of two spermatozoa from an ape.

Spermatozoa of an Ape

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality,…