vni PREFACE TO THE SEVENTH EDITION. 



So far back as 1879 the differentiation of Pleuro-Pnenmonia 

 Contagiosa and Broncho-Pneumonia had been a disputed ques- 

 tion between the Veterinary Officers of the Privy Council and 

 the Author, and this matter has recently assumed alarming 

 proportions in consequence of the great and useless slaughter 

 of Cattle involved under the Privy Council Orders, and the 

 consequent immense financial loss to Farmers and Cattle 

 Importers, and also to the public in increased taxation, as 

 well as the nation generally in the enhanced price of its 

 food supply. 



The Author desires to call the attention of liis professional 

 brethren to tlie Chapters on Pleuro-Pnenmonia Contagiosa for 

 the history of this question, and the Illustrations there given, 

 as he considers that the matters discussed therein are calculated 

 to benefit the public, and, if thoroughly understood, to raise the 

 standard of Veterinary Science. 



The Author has to thank Professors Hunter and W. 0. 



Williams, and others, for the preparation of sections of various 



diseased structures throughout th(^ work. 



W. W. 



New Veterinary College, 



Edinburgh, Januarii 1893. 



