The Early Life of Abraham Lincoln, New York, 1896. For the Emancipator's maternal line see Nancy Hanks, by Caroline Hanks Hitchcock. New York, 1899.

The Life of Pasteur by his son-in-law, René Vallery Radot, should be read by every student of biology.

Hollingworth, H. L., Vocational Psychology, pp. 212-213, New York, 1916.

Sir Francis Galton and C. B. Davenport have called attention to the probable inheritance of artistic ability and lately H. Drinkwater (Journal of Genetics, July, 1916), has attempted to prove that it is due to a Mendelian unit. The evidence alleged is inadequate to prove that the trait is inherited in any particular way, but the pedigrees cited by these three investigators, and the boyhood histories of such artists as Benjamin West, Giotto, Ruskin and Turner, indicate that an hereditary basis exists.