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other animals, namely—a tail.

      3

      The ovum is really the fully mature egg ready for fecundation; before maturity it should not be called ovum but oöcyte; and in advanced treatises it is so referred to. But here ovum will do for both the unripe and ripe egg.

      4

      Hair-

1

Mucous membrane—briefly a membrane which secretes mucus or some other fluid.

2

The coccyx consists of three rudimentary vertebræ; it is the vestige of an organ which we once possessed in common with many other animals, namely—a tail.

3

The ovum is really the fully mature egg ready for fecundation; before maturity it should not be called ovum but oöcyte; and in advanced treatises it is so referred to. But here ovum will do for both the unripe and ripe egg.

4

Hair-like appendages.

5

Each ovum has one germinal vesicle; occasionally one ovum may contain two germinal vesicles; and from the impregnation of such an ovum a twin pregnancy may result.

6

For instance, in rabbits one month, in dogs two months, in sheep five months, in cows nine months, in horses eleven months.

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