ABSTRACT
The human adult seldom performs for the first time in his life tasks involving intelligence of so simple a nature that they can be easily investigated; and when in more complicated tasks adult men really find a solution, they can only with difficulty observe their own procedure. So one may be allowed the expectation that in the intelligent performances of anthropoid apes we may see once more in their plastic state processes with which we have become. This chapter provides experimental details about some animals. Since animals below the stage of development of anthropoid apes give, in general, negative results, there has arisen out of these experiments the view widely held at present, that is, that there is very little intelligent behaviour in animals. It describes seven of the animals belonged to the old branch of the anthropoid station which the Prussian Academy of Science maintained in Tenerife from 1912 to 1920.
