Little Blue Book No. 693 New Experiments in Animal Psychology

64 pp. circa 1920s-40s. Illust. Some discoloration due to paper used for printing. Haldeman-Julius was a radical publisher who began this series in the 1920's with the classics and expanded to include many social issues, political topics, essays on alternative religions and philosophies, as well as pamplets on practical advice. He wanted his line accessible to working people and so priced them accordingly and made them pocket size. Highly collectible.