286 MAINE AGRICULTURAL EXPERIMENT STATION. I914 



6. The material from the resorbed yolks or eggs is appar- 

 ently utilized in body metabolism since all such birds which 

 were in good health at the time of autopsy were very fat. 



7. The removal of the greater portion of an oviduct does 

 not cause the atrophy of any remaining portion. 



8. The whole or any remaining part of an oviduct sewed at 

 the funnel, ligated at any level, or with parts removed, pass"^? 

 through growth and cyclic changes coordinated with changes 

 in the ovary exactly as an unoperated duct. 



9. The stimulation of the advancing egg is necessary for 

 the discharge of the secretion of the duct, since a duct closed 

 at any level functions only to the point where the passage is 

 interrupted. 



10. When any portion of the ventral ligament is removed 

 it is not replaced but all remaining portions develop. 



11. The forward portion of the ventral ligament is neces- 

 sary for the reception of the yolk by the funnel. 



12. The muscle bundles which arise from the muscular cord 

 in the ventral ligament along the uterus are probably an impor- 

 tant part of the normal apparatus which expels the egg. 



Studies on the Physiology of Reproduction in the Domes- 

 tic Fowl. ix. on the Eeeect oe Corpus Tuteum 

 Substance upon Ovulation in the Fowl.* 



In this paper it is shown that the dessicated fat-free sub- 

 stance of the corpus luteum of the cow, when injected in sus- 

 pension, in proper dosage, into an actively laying fowl immedi- 

 ately inhibits ovulation. The duration of this effect varies with 

 different birds from a few days up to two to three weeks. After 

 the bird begins ovulating again the laying goes on unimpaired. 

 The same effect is produced by the injection of extracts of the 

 lutear substance, either intravenously or intra-abdominally. The 

 active substance in producing the inhibition is inactivated by 

 boiling. 



Further investigation of the subject is in progress. 



*This is an abstract of a paper bearing the same title by Raymond 

 Pearl and Frank M. Surface and published in the Journal of Biological 

 Chemistry, Vol. XIX, No. 2, pp. 263-278. 



