PREFACE. v 



the exception of Fig. 8, which is after a sketch by 

 the Hon. Francis Eotch. 



It is to be hoped that the resume of cases here 

 presented may lead breeders to recognize the impor- 

 tance of placing on record the additional facts, from 

 their own experience, that are required for a more 

 complete discussion of the subjects treated in this 

 volume. 



LANSING, MICHIGAN, July 20, 1878. 



