A. C. Coles 
arise, which measure about 40 /r in length. As a rule there were two 
flagella, one being thicker and more deeply stained than the other. 
In some cases they run in the same direction, in others they proceed in 
opposite directions. Some specimens had two nuclei either on the same 
or on opposite sides of the oi’ganism, and from each proceeded two 
flagella of unec^ual thickness. 
These organisms I take to be examples of Monas or Bodo, and they 
are I believe common inhabitants of the digestive tract of various 
animals, especially Lacerta. It is possible that the examples I met 
with were accidental, having come from the intestinal tract. If this 
were the case I should have expected to have seen various other signs of 
intestinal contamination, but the films were very clear, and Plimmer 
has found similar flagellates in the blood of reptiles. I afterwards 
learnt that the lizard in which I found these structures, had been kept 
in captivity for a few days before it was killed. Minchin (1912) states 
that “ in some cases an intestinal parasite may pass from the intestines 
into the blood or lymph under certain pathological conditions of the 
host.” 
Leucocyte Inclusions. 
In the blood of the field vole I have not infrequently met with 
large granules in the protoplasm of the large uninucleated leucocytes. 
These granules stain a deep red, almost black, colour with Giemsa. 
They vary considerably in size. In leucocytes where they are very 
numerous they are not much larger than eosinophile granules, whilst in 
others, in which there may be few, tiiey measure as much as 2 5 to 3 fj, 
in diameter. (Plate IV, fig. 49.) 
They are generally perfectly round, sometimes oval, and rarely 
elongated. 
In the blood of one field vole 40 “/o of all the leucocytes contained 
these granules. They were present also, in smaller numbers, in one of 
the field voles which showed haemogregarines. 
I have also found them in other animals, especially in some of the 
large mononuclear leucocytes of a cow suffering from Redwater Fever. 
I imagine that these are not protozoal, but probably of the nature 
of secretion products. 
