What is language and what is the nature of the intelligence that can acquire it? This volume, originally published in 1976, describes 10 years of research devoted to these questions. The author describes his programmatic research of decomposing language into atomic constituents, designing and applying training programs for teaching these to chimpanzees, and for teaching chimps major human ontological categories, as well as for interrogative, declarative, and imperative sentence forms. One of the earliest ape language and intelligence studies, today this classic can be read and enjoyed again in its historical context.