Laboratory Alunual for the Defection of Poisonnizd Powerful Drugs. By Dr. Wilhelm Autenrieth, professor in the University of Freiburg. Authorized Translation by William H. Warren, Ph.D., professor of Organic Chemistry in Clark University, Worcester, Mass. Sixth American edition from the 5th German edition, completely revised with extensive additions. 60 illustrations, 700 + pp. xxvi. P. Blakiston's Son & Co., Publishers, Philadelphia, Pa. Price $6.00