24. Thinking, Feeling, Doing. By E. W. Scripture.
25. The World's Gold. By L. de Launay.
26. The Interpretation of Radium. By F. Soddy.
27. Criminal Man. By Cesare Lombroso.
28. The Origin of Life. By H. Charlton Bastian.
29. The Bacillus of Long Life. By Loudon M. Douglas.
For list of works in preparation see end of this volume