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"My central object in this work is to discuss the relation of the psychology of man to that of the higher animals, since such a discussion forms in my opinion the best introduction to Comparative Psychology. A secondary object, subordinate indeed, yet forming an integral part of my plan, is to consider the place of consciousness in nature, the relation of psychical evolution to physical and biological evolution, and the light which comparative psychology throws on certain philosophical problems. It was my original intention to compare my own results with those which have been reached by previous observers and thinkers in this field of investigation and inquiry. But I found that, in the first place, this would largely increase the bulk of the book; that, in the second place, it would introduce a controversial tone, which I was desirous of avoiding; and that it would in other ways interfere with what appeared the most convenient mode of developing my subject. I therefore abandoned my original intention, and adopted a more direct method of exposition and discussion. It is, however, all the more incumbent on me to acknowledge my indebtedness to my predecessors and contemporaries. Those whose acquaintance with the subject is most wide and extensive, will best be able to judge how far what I have written is a mere restatement of what has already been written, and how far, if at all, I have done something towards advancing the boundaries of our knowledge or rendering the knowledge that we possess clearer and more exact. Others will perhaps do well to regard me as a secretary who has, I trust, with due diligence thrown into convenient form the data with which he has been supplied"--

Psychology, Comparative.