only to write it down as if I were copying a completed manuscript.
If these phenomena are to be brought within the scope of behaviourist psychology, it must be by means of "implicit" behaviour. Watson makes much use of this in the form of talking to oneself, but in apes it cannot take quite this form. And it is necessary to have some theory to explain the success of "implicit" behaviour, whether we call it "thought" or not. Perhaps such a theory can be constructed on Watson's lines, but it has certainly not yet been constructed. Until the behaviourists have satisfactorily explained the kind of discovery which appears in Köhler's observations, we cannot say that their thesis is proved. This is a matter which will occupy us again at a later stage; for the present let us preserve an open mind.
