is the result of the interaction of his hereditary characteristics
and his environment.


CLASS EXERCISES

1. Try to find rock containing the remains of animals. You can get
information on such matters from a textbook on geology.

2. Read in a geology about the different geological epochs in the
history of the earth.

3. Make a comparison of the length of infancy in the lower animals and
in man. What is the significance of what you find? What advantage does
it give man?

4. What is natural selection? How does it lead to change in animals?
Does natural selection still operate among human beings? (See a modern
textbook on zoölogy.)

5. By observation and from consulting a zoölogy, learn about the
different classes of animal forms, from low forms to high forms.

6. By studying domestic animals, see what you can learn about heredity.
Enumerate all the points that you find bearing upon heredity.

7. In a similar way, make a study of heredity in your family. Consider
such characteristics as height, weight, shape of head, shape of nose,
hair and eye color. Can you find any evidence of the inheritance of
mental traits?