和訳お願い致します。
It is evident that, in entering upon this wider field, I shall frequently have to quit the narrower limits of direct obser vation within which my former work was confined ; and it is chiefly because I think it desirable clearly to distinguish between the objects of Comparative Psychology as a science, and any inferences or doctrines which may be connected with its study, that I have made so complete a-partition of the facts of animal intelligence from the theories which I believe these facts to justify.
So much, then, for the reasons which have led to the form of these essays, and the relations which I intend the one to bear to the other. I may now say a few words to indicate the structure and scope of the present essay. Every discussion must rest on some basis of assumption ; every thesis must have some hypothesis. The hypothesis v which I shall take is that of the truth of the general theory of Evolution : I shall assume the truth of this theory so far as I feel that all competent persona of the present day will be prepared to allow me. I must therefore first define what degree of latitude I suppose to be thus conceded.
