Figures 334-338. — Stages in the development of lymphocytes in the thymus. All figures from the 

 same slide. Embryo incubated 14 days 11 hours. 2,470X. 



334 Large lymphoblast. Nucleus incompletely stained. 337 Mature lymphocyte of medium size. 



335 Lymphoblast at transition to immature lymphocyte. 338 INLature lymphocyte of small size. 



336 Immature lymphocyte. 



174 



