Fig. 195.—Cock and Hens.
EXERCISES ON CHAPTER XVI.
1. Point out the differences in appearance and position between the white and yolk of a fowl’s egg. What becomes of each during the development of the egg?
2. When does the heart of a chick begin to beat? Describe its appearance at this time, and explain what must be done to expose it to view.
3. Explain exactly where the chick is to be found in a fertile egg which has been incubated for three days. How big is a chick of that age? Of what colour is it? Does it give any signs of life? (1898)
4. What is the amnion? Where, in a developing chick, is it to be found, what is its appearance, when and how is it formed, and what is its use?
5. Explain the nature and use of the “balancers” of an egg.