cal-shaped
granules.

_Mouse._--The granules of the _polymorphonuclear_ leucocytes are usually
not stained, or only very faintly so. The nucleus of the _eosinophile
cell_ is ring-shaped or much divided, and the granules are coccal and
stain oxyphile. The remarkable character of the blood is the high
percentage of large _mononuclear_ cells.

_Rat._--The fine rod-shaped granules of the _polymorphonuclear_
leucocytes are usually very faintly stained. The granules of
_eosinophile_ cells are well stained and coccal-shaped, the nucleus is
often ring shaped. The _basophile_ granular cells are few--but the
granules are large, and stain deeply basophile.

_Guinea-pig._--Polychromasia and punctate basophilia of _red cells_ are
very commonly observed--nucleated red cells are also frequent. The large
_mononuclear_ cells often contain vacuoles--"Kurlow cells"--possibly of
a parasitic nature.

_Rabbit._--It is not uncommon to find nucleated _red cells_ in films
from quite healthy animals. The granules of the _polymorphonuclear_
leucocytes stain oxyphile. The coarse granules of the _eosinophile_
cells appear to stain less deeply oxyphile, probably owing to the
basophile staining of the cytoplasm.

_Rhesus monkey._--The blood cells resemble those met with in human
blood. The minute neutrophile granules of the _polymorphonuclear_
leucocytes are often very scanty, and sometimes apparently absent. The
_eosinophile_ cells are not so densely packed with coarse oxpyhile
granules as in the human eosinophile, and the nuclei of these cells are
usually much divided, or polymorphous.

_Goat._--The _red cells_ are small, nonnucleated discs, only about 4.5
mu diameter, not much more than half that of the human red cell. The
_polymorphonuclear_ leucocytes have only a few very minute
coccal-shaped oxyphile granules, the nucleus is polymorphous. The
_eosinophile_ cells are large cells up to 20 mu, the cytoplasm is
basophile and contains coarse coccal-shaped oxyphile granules, and the
nucleus is often much divided.

_Fowl._--The _red cells_ are oval nucleated discs about 12 mu by 6 mu, the
nucleus being relatively small (about 4 mu long), irregularly elongated or
oval; round, more deeply stained cells with round or diffuse nuclei,
also free nuclei and degenerated forms of red cells are often present.
The granules of the cells corresponding to the _polymorphonuclear_
leucocytes are rod-shaped, often beaded or with clubbed ends. The
nucleus is