PBEFACE vii 



along this line than he has gone heretofore. Care has 

 been exercised not to sacrifice the popular phase upon 

 which our knowledge of the subject is based but to bridge 

 over onto a more technical consideration of it. 



It is hoped that the author's intention of keeping the 

 work thoroughly practical, yet giving it a touch of a 

 somewhat technical nature, will be appreciated by students 



and stockmen alike. 



CARL W. GAY. 



PHILADELPHIA, 

 July 1, 1914. 



