IXXERVATION OF THE GENERATIVE ORGANS 585 



been studied by Weymeersch, 1 who states that the placenta may for 

 a time persist. If the abortion is produced experimentally by the 

 removal of the ovaries the absence of the corpus luteum results in an 

 immediate contraction of the uterine vessels as well as of the uterine 

 muscle wall. Fortayn 2 also states that the chorion survives after 

 the death of the embryo in the mouse. 



The changes which take place in connection with the formation 

 of milk in animals are described in the next chapter. 



1 Weymeersch, " Etude sur le Mechanisme de FAvortement,- etc." Thee 

 Universite de Bruxelles, Paris, 1911. See also June. <!> f'Anat. et /%*., 

 vol. xlvii., 1911. 



2 Fortayn, " The Involution of the Placenta in the Mouse after the Death 

 of the Embryo," Archiv. '!>' !><"!. , vol. xxx.. 1920. 



19 A 



