PREFACE TO THE THIRD EDITION 



The Preface to the First Edition sufficiently explains the scope 

 and purpose of the book. 



The present Edition has been almost entirely rewritten in 

 order to bring it up to date and to give greater prominence to 

 those parts of Physiology which have the most direct bearing 

 upon veterinary practice. 



Our thanks are due to Dr. Burns for the section on hydrogen 



ion concentration in Appendix III., and to Mr. William Dunlop 



of Dunure for valuable suggestions on the section dealing with 



the limbs of the horse. 



D. N. P. 

 J. B. O. 



September 1920. 



Til 



