L8« 



V*i It- * ibl rfw: w 



Figs. 3-1 through 3-9. Photographed from supravital films with the phase contrast 

 microscope (dark medium contrast), (x 2000; reduced 25 per cent) 



Fig. 3-1. Two small lymphocytes. Note the filamentous mitochondria and spherical 

 neutral red staining granules. 



Fig. 3-2. An "old" lymphocyte containing spherical mitochondria and a few neutral 

 red granules. Cytoplasm is less basophilic and opaque than the lymphocytes in Fig. 3-1. 



Fig. 3-3. Small mature lymphocyte. Note small irregular nucleolus. 



Fig. 3-4. Medium-size lymphocyte with localization of mitochondria and granules 

 around the clear cytocentrum. 



Fig. 3-5. Small young lymphocyte with indented nucleus. The cytocentrum is rather 

 clear, and small neutral red granules localize in this region. Mitochondria are peripheral 

 to the cytocentrum. 



Fig. 3-6. Large young lymphocyte containing a moderate number of granules and both 

 spherical and filamentous mitochondria. 



30 



