l68 NORMAL HISTOLOGY. 



numbers, are concentrically-arranged clusters of flat 

 cells, concentric corpuscles or HassaU's corpuscles. 



After birth the thymus grows smaller and finally 

 disappears, being often represented by a mass of 

 connective tissue and fat. 



TECHNIQUE. 



The thymus of a child is cut in small pieces and 

 hardened in Mtiller's fluid. After imbedding in cel- 

 loidin, sections are cut, stained double and mounted in 

 balsam. 



