Originally published in 1924, this early work on the intelligence of Apes is both expensive and hard to find in its first edition. It comprehensively details the observations of a scientific study on the ability of Apes to make, use and handle tools. This is a fascinating work and highly recommended for anyone interested in primate psychology. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.