50 REPRODUCTIVE SYSTEM OF THE ADULT FROG 



ciliary currents anteriorly toward and into one or another of the 

 ostia. This can be demonstrated easily by opening the body cavity 

 of an actively ovulating frog or by excising a strip of ventral abdom- 

 inal wall of the adult female, inverting it in amphibian Ringer's solu- 

 tion, and placing on it some of the body cavity eggs. Any object of 



Deposition of jelly on the frog's egg. (Top) String of eggs removed from the 

 oviduct to show the deposition of jelly. The jelly is swollen in water. (Bottom) 

 Frog's eggs showing varying amounts of jelly, indicating progressive deposition 

 along the oviduct. (A) From upper third of oviduct. (B) From middle of 

 oviduct. (C) From body cavity (no jelly). (D) From uterus. 



