Goddard, The Kallikak Family. The Macmillan Company.

Kellicott, The Social Direction of Human Evolution. Appleton Company.

Punnet, Mendelism. The Macmillan Company.

Richards, Helen M., Euthenics, the Science of Controllable Environment.

Walter, Genetics. The Macmillan Company.

XVIII. THE HUMAN MACHINE AND ITS NEEDS

Problem.—To obtain a general understanding of the parts and uses of the bodily machine.

Laboratory Suggestions

Demonstration.—Review to show that the human body is a complex of cells.