I 4 8 THE PHYSIOLOGY OF REPRODUCTION 



The characteristics of the corpus, luteuin at different stages of 

 pregnancy have Wn described by van der Stricht, 1 Corner, 2 and 

 others. At first the luteal cells contain a large quantity of fat or 

 lipoid which is epithelial in nature. This decreases, but at a later 

 stage there is a reappearance of fatty material due to senescence. 

 Before retrogression sets in there is a diversity in the character of 

 the cells, some showing considerable peripheral canalisation while 

 others show only endoplasm. 3 According to Corner the corpus luteum 



b i^ i V O '. . 



:;>:>- >* :'.<if:; 



=,.---- 



'li?M 



'&m&. 



FH.. I:'.. ><' tiii tlirougli old corpus liitrum. (From Sellheim.) 

 C, Connective tissue ; L, luteal tissue. 



of pregnancy is distinguished from that of ovulation by the more 

 regular and uniform morphology of the former, and the greater 

 infiltration of fat in the latter. 



1 Van d-r Stii'lit, " Snr ! processus de Pexcretion des glandes endocrines,' : 

 . I /. / A'/'./., vol. xxvii., 11H2-13. This pajjer deals with bats. 



2 Conn i. "'I'll- < '"i PH.. Liiteiiin <>f Pregnancy, aa it is in Swine," Contriimtions 



,/,,>/'>/"</'/,( ';u rir.irif Institution, \Va-hiin, r ton, 1 !!.">. This paper goes into 

 great detail and ^ive- nuiin-i..ii- i.-f.-n-i. 



tic, " !{< hiTchi-s sur It- Follicle <! ( iriaf et le Corps Jaune 

 de la Va.-ln-." .//-. / f'-ii"it. '' f>li*iol. (ftr.), vul. \lvi.. P.tlo ; Hegar, "Studien 

 xur Histogenese des Corjms Luteum und s. in. i Kiirkbildung.sprodukte," 

 .I/-./-. /". li-tit.. vol. M-i.. I'.MO: and lri|-. "Studios on the Ovary of the 

 Spernio|iliil--. . .////. .!/,<//., vol. \\\-., |<M!i. Tin- last paper describes 



tlnv- (ilia-"- (r'd L'l'aiiulfs. lipoid diopl.-t-. and rfLrn-.-Mon). 



