v PREFACE. 



With this view of still further condensing the work, the doses 

 of medicines for the different animals are rarely given in the 

 text, but one or more agents are named as applicable to every 

 distinct stage or phase of the disease and species of parient, 

 and the reader must turn to the list of drugs given at the end 

 to find the amount required for each animal. In doing this he 

 must note particularly for what purpose the agent is given, and 

 select the dose accordingly, as the effect of large doses is usually 

 essentially different from that of small ones. Thus common 

 salt given in large doses to cattle is purgative and reducing, 

 while in small ones it is alterative and tonic. Sulphur in large 

 doses is laxative, but in small ones alterative, expectorant, and 

 diaphoretic. Oil of turpentine in large doses is purgative, 

 diuretic, and vermifuge, in small ones stimulant and anti- 

 spasmodic. Attention must also be given to the age and size 

 of the patient, as more fully set forth in the Appendix. 



Illustrations have been freely introduced to render the text 

 more lucid, and, being selected from those prepared for largei 

 M^orks, may be implicitly relied on. 



In the list of contagious diseases are included not only those 

 that are habitually developed on British soil and those already 

 introduced from abroad, but also such as prevail in America, 

 and are liable at any time to be brought into our midst by 

 importation. It is no less imperative that the British farmer 

 should be forewarned of pestilences that threaten him from 

 abroad, than of those that beset him at home. For all such 

 affections the principles that should guide us in preventing and 

 extinguishing the disease are concisely but clearly set forth. 



Al] the important parasites are introduced, and their con- 

 ditions of life and individual metamorphoses in and out of 

 tb^ bodies of domestic animals referred to, as well as their 

 migrations from man to animals and from animals to man 

 v/herever such exists. The vast importance of animal parasites 

 is only beginning to be realised in connection with their 



