250 
Trypanosomes in a Coin 
The cow from which Mr Wood obtained the blood films was a Short¬ 
horn about eight years old, from a farm in Dorset. On June 2nd and 3rd 
the urine was of a deep red colour, but during the latter day it became 
almost clear, being only slightly tinged. 
In the evening of June 3rd at G p.m. four more films were taken. 
These were, as Mr Wood says, very badly and unevenly spread, as the cow 
was very restless. 
These seven films were systematically examined and in one of 
them a perfect trypanosome was found. Subsequently in the same 
preparation another trypanosome was also found showing considerable 
distortion. 
On June 6 Mr Wood took me over to see the cow and I made about 
20 more films, but after a prolonged examination no more trypanosomes 
were detected. 
Description of the Trypanosome. The parasite has the form of an 
almost perfect S, being thickest in the middle of the body and tapering 
towards both extremities. 
The Body is stained a deep violet-blue colour with Giemsa and is 
filled with minute granules closely packed together in all but the 
extremities, which are quite free from granules for about 10 y in the 
anterior end and for about 8 of Q y in the posterior end. The thickest 
part of the body is about the region of the nucleus, but it continues at 
the same width for about 16 y, after which it graduallj'’ tapers towards the 
extremities, both of which terminate in fine points, especially the anterior 
or flagellar end. There is no difficulty in determining the exact point 
at which the anterior extremity of the body ceases and the free portion 
of the flagellum begins. 
The somewhat abrupt termination of the granular protoplasm of the 
body gives an impression of the posterior extremity being merely 
a sheath. There are no indications of myonemes, although some of the 
granules are arranged somewhat longitudinally. 
The undidating membrane is thrown into a number of folds and is 
stained a pale lilac colour, in which the granules are loosely scattered in 
marked contrast to their compact arrangement in the body. 
The undulating membrane is bounded by a very distinct border, the 
attached part of the flagellum, whilst the free portion of the latter is 
short, measuring only about 10 y. The trophouucleus is situated 
almostly exactly at the middle of the body. Its greatest diameter lies 
transversely to the long axis of the parasite. It measures 6 //. by 3'3 y. 
Its shape is somewhat like the letter B, the anterior border being 
