red-violet colour, e granulation) with the neutral 
constituent of Erhlich’s triacid stain. The nucleus is 
convoluted, horse-shoe or S-shaped, staining deeply. 
The granules are fine and stain reddish with Roman¬ 
owsky. These cells are markedly amoeboid and = 
mikrophages ; but malarial pigment is very uncommon 
in them (Fig. 2). 
Eosinophil Leucocyte .—12-15A 6 - The nucleus is 
polymorphic in type but very frequently consists of two 
lobes joined by a strand ( pince-nez ;) staining less deeply 
than the previous form. Characteristic are the large 
granules (a or oxyphil granulation), which stain coppery 
red with triacid, Jenner, Leishman and Giemsa, but 
faintly only or not at all with ordinary Romanowsky, 
unless the blue is well washed out (Fig. 2). 
Mast Leucocyte (or basophil cell).—About 10//,. The 
nucleus is of an irregular characteristic polygonal shape, 
and stains very feebly. Characteristic also are the baso¬ 
phil (7) granules, which are even larger than eosinophil 
granules. They are soluble in water, so that to shew 
them properly an alcoholic stain is necessary, e.g., 
Jenner’s. Triacid does not shew them. Romanowsky, 
Giemsa, and Leishman do not shew them well. With 
absolutely pure methylene blue they stain blue, but 
methylene blue nearly always contains a trace of 
‘ azure ’ and they stain instead with this derivative, 
i.e ., they stain violet. This is spoken of as staining 
metachromatically; and this property of staining, not 
with a pure stain but with its derivative, is character¬ 
istic of mast granules (Fig. 2). 
Lymphocyte. —Two forms occur (a) young forms 
6—9^, i.e ., about the size of a red cell, forming the 
majority. These have a round or oval nucleus staining 
deeply, and the rim of protoplasm is quite narrow and 
deeply basophil, (b) Old forms about 12The 
