414 CAULE. [Vol. VIII. 



ophilous cell, follicle cell, pigment, plasmosoma and cell-division 

 curves are similar. 



A closer analysis of the curves than is given here is reserved 

 for a more extended article and until a further study of the 

 female sexual organs and the cyclical changes in other organs 

 and tissues of the body has been completed. 



The present curves, at the least, demonstrate the fact that 

 the character of the microscopical elements of the spleen are 

 to a certain extent dependent upon the external surroundings 

 and habits of the frog. 



Zurich, August 8, 1892, 



