The Bacillus of Long Life / A Manual of the Preparation and Souring of Milk for Dietary Purposes, Together with an Historical Account of the Use of Fermented Milks, from the Earliest Times to the Present Day, and Their Wonderful Effect in the Prolonging of Human Existence

by Loudon M. Douglas

14. Earthquakes. By Clarence E. Dutton.

15. The Nature of Man. By Élie Metchnikoff.

16. Nervous and Mental Hygiene in Health and Disease. By August Forel.

17. The Prolongation of Life. By Élie Metchnikoff.

18. The Solar System. By Charles Lane Poor.

19. Heredity. By J. Arthur Thompson, M.A.

20. Climate. By Robert DeCourcy Ward.

21. Age, Growth, and Death. By Charles S. Minot.

22. The Interpretation of Nature. By C. Lloyd Morgan.

23. Mosquito Life. By Evelyn Groesbeeck Mitchell.