Orang-outang, sive homo sylvestris: Or, the anatomy of a pygmie compared with that of a monkey, an ape, and a man.

The earliest work of importance in comparative morphology. Tyson compared the anatomy of man and monkeys and between the two he placed the chimpanzee, which he regarded as the typical pygmy. This was the origin of the idea of a “missing link” in the ascent of man from the apes. Facsimile reprint with introduction, 1966. Biography of Tyson by Ashley Montagu, Philadelphia, 1943.