4&9 
70 kilograms and the weight of our four rats as varying between 
139 grams and 256 grams, and we find that the doses we 
administered to the rats, when calculated to the body weight of a 
man would represent doses varying between 4' 5 5 grains and 25*14 
grains. Rats 34 and 35, being the lighter rats, having received the 
same doses as Rats 36 and 37, therefore received a relatively larger 
dose when we consider the body weight. We now append tables 
of numbers of trypanosomes per c.mm. of peripheral blood and the 
doses of atoxyl given to Rats 34, 35, 36 and 37, and we also give 
graphs of the Rats 34, 35 and 36, which show the variations of the 
numbers of parasites in the peripheral blood. 
Rat 34.— Piebald, weight 139 gram,. Treated in Animal House with small doses of atoxyl. 
Inoculation dose: 200.000 T. rbodeuense 
Day . 
1 
2 
3 
4 
5 
6 
Number of Trypanosomes per 
c.mm. of blood . 
— 
— 
— 
I i 39 2 
Atoxyl in grains . 
— 
— 
— 
— 
* 
Day . 
8 
9 
10 
11 
12 
13 
1+ 
Number of Trypanosomes per 
8,118 
10,500 
888 
101,200 
96,800 
c.mm. of blood . 
40,460 
1,440 
5,000 
Atoxyl in grains . 
A 
— 
A 
— • 
— 
A 
Day . 
>5 
16 
»7 
18 
>9 
20 
21 
Number of Trypanosomes per 
c.mm. of blood 
73 - 9 2 ° 
A 
4,000 
20,496 
5 i 796 
12,696 
3,864 
I 9 >» 3 6 
Atoxyl in grains . 
— 
A 
— 
A 
A 
Day . 
22 
2 3 
24 
2 5 
26 
27 
— 
Number of Trypanosomes per 
c.mm. of blood 
1 24.OOO 
73 > 9 2 ° 
48,000 
4 2 - 3 2 o 
168,960 
242,880 
- 
Atoxyl in grains 
: — 
| * 
A 
— 
A 
