62 



REPRODUCTIVE SYSTEM OF THE ADULT FROG 



Lateral loops of the amphibian chromosome. The lateral loops originate from 

 chromosomal granules and the lateral branches are not homogeneous in struc- 

 ture, but are made up of smaller particles embedded in a hyaline cylinder. These 

 lateral loops occur in separable clusters of 1 to 9 loops along a single chro- 

 monema. These loops reach their greatest development at stage 4, when the 

 chromosome frame is most expanded. They average 9.5 microns in length but 

 may reach 24 microns. They are not resorbed back into the chromosome and 

 the number of loops per chromosome decreases with time, although the number 

 of chromomeres per chromosome remains constant. (Courtesy, W. R. Duryee, 

 1950, Ann. N. Y. Acad. ScL, 50, Art. 8.) 



gradient of concentration of oval yolk platelets from one side of the 

 egg to the other. The smaller platelets are found in the vicinity of 

 the nucleus, in the animal hemisphere. The larger platelets are lo- 

 cated toward the vegetal hemisphere. There is an increase averaging 

 from 200 to 700 per cent in the total lipoid substance, neutral fat, 

 total fatty acids, total cholesterol, ester cholesterol, free cholesterol. 



