igii] Carl L. Aisberg 115 



The Effect of Pregnancy on the Lipins o£ the Ovary and 

 Corpus Luteum of the Cow 



JACOB ROSENBLOOM 



(Laboratory of Biological Chemistry of Columbia University, at 

 the College of Physicians and Surgeons, New York.) 



A comparative study of the amounts of neutral fat, fatty acid, 

 lecithan and cholesterol, in ether and alcohol extracts of the ovary 

 and corpus luteum of the cow, showed that pregnancy had no effect 

 on the respective proportions in which these substances appeared 

 in the extracts. 



The Relation of Permeability to Fertilization of the Ovum 



E. P. LYON AND L. F. SHACKELL 



{United States Fish Commission, Beaiifort, N. C.) 



Comparative chemical analyses tend to show that ions such as 

 Ca, Mg and SO4 pass more readily out of fertilized than unfertil- 

 ized echinoderm (Arbacia) eggs when the latter are suspended in 

 an m/2 NaCl Solution. 



When thick suspensions of eggs are fertilized in sea-water, sub- 

 sequent analyses both of the eggs and of the supernatant sea-water 

 indicate that a considerable amount of Ca enters the eggs at the 

 time of fertilization. 



Although Lyon had previously shown that under otherwise 

 equal conditions, fertilized eggs (Arbacia and Toxopneiistes) were 

 able to catalyze hydrogen peroxide more rapidly than unfertilized, 

 more recent experiments, using Arbacia eggs and sperm disin- 

 tegrated by shaking with finely powdered glass, have shown that 

 disintegrated eggs plus disintegrated sperm, disintegrated eggs plus 

 fresh sperm, or fresh eggs plus disintegrated sperm produce only 

 additive catalytic effects. 



The more rapid staining of fertilized than unfertilized Toxo- 

 pneiistes eggs with methylene blue and dahlia was shown to be 

 due to the entrance of a greater quantity of stain in the first instance 



