526 
We append table: 
Rat 50. — Piebald, weight 77 gram*. Do»e of inoculation : 200.000 Trypanosome* 
T . rbodesiensr 
Day 
r 
2 1 3 
4 
5 
6 
7 
% 
Number of Trypanosomes per 
c.mm. ... 
X-rays for 20 minutes ... 
— 
— 60 
“ 1 ~ 
32,256 
— 
227,840 
X-ray» 
305.376 
287.776 
X-ray* 
350,00 
Day 
9 
10 
11 
12 
*3 
*4 
'5 
Number of Trypanosomes per 
c.mm. ... 
X-rays for 20 minutes ... 
252.320 
350,000 
350,000 
X-rays 
410,000 
366,000 
X-ray* 
430,000 
- 1 
323.84c 
X-ray* 
1 he animal always seemed to brighten up during the exposure 
to the rays. I he trypanosomes, it will be noted, increased in 
numbers in the peripheral circulation after each exposure, and we 
would conclude that there was no destruction of the trypanosomes. 
I his is exactly in line with the experiments made by one of us (R.R.) 
several years ago, who found that exposure of the trypanosomes 
v ** ro to the influence of X-ray had no trypanocidal action. 
V. LEUCOCYTIC EXTRACT 
This experiment was carried out at the suggestion of Dr. 
Moore Alexander, Pathologist to the Royal Southern Hospital, and 
he very kindly prepared the extract for us. 
A white rat, weighing 120 grams, was inoculated with the 
10 esian strain of trypanosomes, and the disease was allowed to 
cu ate. On the twelfth day, when the trypanosomes numbered 
9.000 per c.mm., we injected subcutaneously o' 5 c.c. of leucocytic 
extract. The following day the trypanosomes numbered 220,800per 
c.mm., and the leucocytes rose from 8,160 per c.mm. to 10,764 per 
T' . ammal 1,ved fourteen days. We cannot, therefore, draw 
conclusions here, and much further work will have to be undertaken 
t ° rC WG concIude as to the value of leucocytic extract in 
