Krall, Karl

Lot 1033 limit € 30

thinking animals. Contributions to animal psychology based on my own experiments., "The clever Hans and my horses Muhamed and Zarif", with illustrations based on my own photos, Leipzig: Verlag von Friedrich Engelmann, 1912, linen cover, signs of age and wear (among other things, the pages are compressed at the bottom right at the beginning, Binding slightly rubbed.)