PREFACE 



TN the following treatise I have endeavoured to 

 ■^ combine my experiences with that of other 

 writers on a subject which must be of great 

 interest to the veterinary profession generally, 

 especially in this country at the present moment, 

 and it attempts to give a clear and complete 

 account of a subject about which there is at 

 present a paucity of English veterinary literature. 

 References to the literature on the subject 

 have been freely made, but I wish to express my 

 indebtedness to the works of Nocard and 

 Leclainche, and Tokishige, and also to state that 

 I am greatly indebted to Professor Boyce in 

 permitting me to publish my work under the 

 auspices of the University Press of Liverpool. 



W. A. PALLIN 



June, 1904 



