PLATE 1 
EXPLANATION OF FIGURES 
Blood 
1 to3 Normal, older, and senile types, respectively, of erythrocytes. The 
color of the nucleus changes from violet to lilac, the cytoplasm from bluish green 
to yellow, in passing from 1 to 3. 
4 to 6 Small, ameboid, and medium-sized lymphocytes, respectively. The 
nucleus stains a deep lilac or violet color; the cytoplasm contains finer and 
coarser irregular and clumped basophilic (blue) granules, among which may 
appear a variable number of small spheroidal metachromatic (lilac-colored) 
granules. 
7 Similar medium-sized lymphocyte with numerous pseudopods, some of 
which have liberated spheroidal granulated globules by a process of constriction. 
Except for the blue color of their granules, these globules are apparently identical 
with blood-platelets of mammals. 
8 Large lymphocyte with reniform nucleus. The cytoplasm contains a 
small amount of a metachromatic granulation scattered among the predomin- 
ating basophilic (blue) granules. 
9 Large lymphocyte, with nuclear and cytoplasmic characteristics like those 
of small lymphocytes. 
10 Similar large lymphocyte, with reniform nucleus and a conspicuous 
diplosome opposite the nuclear concavity. 
11 Binucleated eosinophilic leucocyte (mononucleated, polymorphonuclear, 
and polynuclear types also occur). The nucleus has a deep lilac color. The 
eosinophilic granules are imbedded in a homogeneous basophilic (blue) sub- 
stratum. The granules maintain a fairly uniform size; they appear ring-shaped, 
indicating a difference in condensation between center and periphery. The 
nucleus almost invariably takes a polar position. 
12 Basophilic granulocyte (mast-cell). The nucleus is located centrally; it 
is relatively large and vesicular, staining a light blue color, and showing a delicate 
reticulum. The granules have a deep lilac color, are fairly uniform in size, and 
in general slightly larger than the granules of the eosinophilic leucocytes. 
13 to 15 Mononucleated (young) types of neutrophilic granulocytes. The 
nucleus has a lilac color. The fine neutrophilic granules are imbedded in a 
lightly basophilic (blue) cytoplasm. Figure 13 shows a conspicuous dipiosome 
about which the granules are disposed in radiating lines. Figure 15 shows two 
pseudopods. 
16 Neutrophilic granulocyte with bilobed (dividing) nucleus, and conspicuous, 
finely granulated centrosphere. | 
17 Binucleated neutrophilic leucocyte. 
18 to21 Various types of polymorphonucleated neutrophilic leucocytes. 
22 Polymorphonucleated neutrophilic leucocyte of blood of dog. 
23 to 26 Various, more complex types of polymorphonucleated neutrophilic 
granulocytes. Figure 23 shows a dense granular centrosphere; figure 24, a clear 
sphere with a dumb-bell-shaped centrosome (centriole). 
27 to 29 Types of thrombocytes. The nucleus is a dense granular body, 
staining a violet color. The cytoplasm forms a meagre shell of viscid homo- 
geneous character. This contains a variable amount of fine uniform, meta- 
chromatic (lilac) granules. The general shape of the thrombocytes is fusiform, 
but spheroidal and oval forms also occur (fig. 29). 
30 and 31 Thrombocytes with pseudopods, some of which liberate granulated 
stellate globules. The latter simulate very closely the blood-platelets of 
mammalian bloods. 
32 Naked disintegrating nucleus of a degenerating thrombocyte. 
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