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. 
(F'g- 4 )- 
Plasma Cell .— = inflammatory leucocyte or phlogo- 
cyte. They are large cells, 10-20/x, generally 10-15^. 
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 
