CONTENTS. 



Introduction 



Breeding habits of the sow 



General features of the corpus luteum 



Histology of the corpus luteum of the sow . 



Cytology of the lutein cell 



Life history of the lutein cell of pregnancy . . 



PAGE. 



71 

 72 

 72 

 73 

 75 

 79 



Previous observers on the corpus luteum at vari- 

 ous stages of pregnancy 80 



Characteristics of the corpus luteum at the various 



stages of pregnancy 81 



PAGE. 



Criteria of age of the corpus luteum 82 



Theoretical considerations 84 



Distinction between the corpus luteum of preg- 

 nancy and of ovulation 85 



Influence of pregnancy on the structure and func- 

 tion of the Graafian follicles 86 



Abnormalities of the lutein tissue 88 



Migration of the ovum in the sow 90 



Conclusions 92 



Literature cited 93 



