Excerpt from Comparative Anatomy and Physiology
The reader who is sufficiently acquainted with the progress in vertebrate physiology during the last phase of physiological methods, and who knows how scattered and incomplete are the investigations which have been made by the same kind of physical and chemical inquiries on invertebrate animals, will not expect to find in the present volume any complete statement of the physiology of animals, in the sense in which that term is now used. Such observations as have been made without especial reference to the vital processes of man are, for the most part, very valuable and suggestive; but the time to write a textbook of Comparative Physiology, as we now understand it, has not yet arrived.
All that I have attempted to do in this little book has been to illustrate the details of structure by a notice of such experimental inquiries as I have convinced myself, or have adequate reason to believe, are, in their broad outlines, correctly stated.
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