HISTOLOGY OF THE THYMUS 323 



the lymph-nodes. This characteristic difference corresponds to 

 the different histogenesis of the thymic reticulum and suggests 

 a different function. 



In conclusion, the writer wishes to express his obligation to 

 Dr. E. G. Kite for his kindness in supplying the vital stains used 

 in this work, and to Dr. R. A. Lambert for his assistance in the 

 preparation of the rat tissue cultures. 



