Radioactivity,and the latest developments in the study of the chemical elements: By Kasimir Fajans,University of Munich. Translated from the fourth German edition by T. S. Wheeler,B.Sc., and W. G. King. xvi–138 pages, 11 diagrams and 14 tables, 8vo. New York,E. P. Dutton and Company,no date. Price, $3.50 net |