al traits from their ancestors,
probably as parts or units. Mendelism is the doctrine of the pure
transmission of unit characters. Eugenics is the science of
improving the human race by selective breeding. An individual's life
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 zooelogy.)

5. By observation and from consulting a zooelogy, 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?

8. Make a complete outline of Chapter II.

REFERENCES FOR CLASS READING

DAVENPORT: _Heredity in Relation to Eugenics_.

KELLICOTT: _The Social Direction of Human Evolution_.

CHAPTER III

MIND AND BODY

=Gross Dependence.= The relation of mind to body has always been an
interesting one to man. This is partly because of the connection of the
question with that of life after death. An old idea of this relation,
almost universally held till recently, was that the mind or spirit lived
in the body but was more or less independent of the body. The body has
been looked upon as a hindrance to the mind or spirit. Science knows
nothing about the existence of spirits apart from bodies. The belief
that after death the mind lives on is a matter of faith and not of
science. Whether one believes in an existence of the mind after death of
the body, depends on one's religious faith. There is no scientific
evidence one way or the other. The only mind that science knows anything
about is bound up very closely with body. This is not saying that there
is no existenc