PREFACE TO THE THIRD EDITION. 



In the preparation of the Third Edition the whole of the 

 text has been carefully revised, but the alterations made 

 have not increased the volume of the work. The Plates 

 which illustrated the First Edition have been faithfully 

 reproduced. 



I venture to hope that the book will continue to be of 

 service to teachers and students in the prosecution of the 

 very important branch of veterinary education to which 

 it relates. 



Royal Veterinary College, London 

 November, 1922 



