A^ 



MICHAEL FOSTER, M.A., M.D., LL.D., F.R.S., 



PROFKSSOR OF PHYSIOLOGY IN THE UNIVERSITY OF CAMBRIDGE, 



THIS ATTEMPT TO DEAL WITH A BRANCH OF PHYSIOLOGY 



IS DEDICATED, 



IN ACKNOWLEDGMENT OF 



ENCOURAGEMENT AND ASSISTANCE RENDERED TO 



THE AUTHOR 



IN PROSECUTING THE STUDY OF EQUINE PHYSIOLOGY. 



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