iv Preface 



in permitting the insertion in our text of his extensive and ad- 

 mirable contribution relating io sterility in cows. 



With a keen sense of the many and serious imperfections, this 

 volume is submitted to the veterinary profession of America, 

 hoping that it may awaken new interest in the practice of 

 obstetrics, and extend some aid to those veterinarians engaged 

 in obstetric work. 



W. Iv. Williams. 

 Cornell University, 



June I, 1909. 



