variety of lymphocyte, and Romanowsky shews no 

 granules. 



These cells require very careful staining for their 

 distinction. Special stains, e.g., pyronin methyl-green, 

 shew three or four nucleoli stained reddish, whereas 

 other leucocytes shew only one or two. They are 

 perhaps most readily recognised by the fact that all 

 stages from these forms to neutrophil myelocytes occur 

 together in the blood. They occur in abundance in 

 myeloid leukaemia and are found also in other anaemias. 



(Fig- 4)- 



Plasma Cell. = inflammatory leucocyte or phlogo- 

 cyte. They are large cells, 10-20^ generally 



Fig. 4. (i) Large Lymphocyte, (2) Mytloblast, (3) Plasma Cell 



Nucleus, round or oval, usually eccentric, relatively 

 small, staining a dirty grey-blue or violet with triacid. 

 No radial arrangement of chromatin, which resembles 

 that of a myelocyte. Characteristic is the intense 

 basophilia of the protoplasm (staining reddish brown 

 with triacid), broad margin and very distinct highly 

 characteristic honey-combed structure. With methy- 

 lene blue the protoplasm stains deeper than the nucleus. 

 They occur in leucocytosis and severe anaemia (Fig. 4). 

 In the tissues in sleeping sickness (p. 340) we have 

 * Marschalko's plasma cell.' In this the chromatin of 



