460 
Rabbit 2. — Grey. Dose of inoculation : 600,000 Trypanosomes, intraperitoneally. 
(J.G.T.) 
Day 
1 2 
3 
* 
4 
5 
6 
7 
Parasite* per c.mm. 
1 - 
— 
- 
- 
Day . 
8 
9 
10 
11 
12 
'3 
4 
Parasites per c.mm. 
- 
— 
2 
8 
12 
48 
2 
Day . 
*5 
16 
*7 
18 
19 
20 21 
Parasites per c.mm. 
>5 
1 
4 
20 
100 
160 
420 
_ 
Day . 
22 
23 
24 
— 
- 
- 
- 
Parasites per c.mm.j 
1,776 
2,320 
2,184 
Died 
- 
- 
- 
COMPARISON OF THE EFFECTS OF THE TRYPANOSOMES 
ON THE VARIOUS HOSTS 
In guinea-pigs the disease tended to run a more chronic couise 
than in rats, as shown by the fact that the animals lived much 
longer. The periods between the crests of the waves in both strains 
in guinea-pigs were longer than in rats, namely five to eight days m 
most cases. Further, in guinea-pigs the initial rise is slower—a 
staircase ’ effect taking place and leading to the chronic condition 
(see Charts 4, 5). 
Some of the guinea-pigs when the disease became chronn 
showed an alternation of high and low rises, which simulate 
remarkably the graph of the parasites of the patient W-A. :. 5ec 
R. Ross and D. Thomson (1910)* ). 
In the two rabbits used it was remarkable that these were the 
■>nly animals that exhibited an affection of the eyes and skin. ^ 
* Proc. Roy. Soc., B, Vol. LXXX 1 I, p. 413. 
