Gr. H. F. Nuttall AND Gr. S. GtRAHAM-SmITH 213 
23. Inoculated subcutaneously with 7 c.c. of virulent blood from Dog 68 
(very sick). 
34. Bled, and c.c. of the jackal’s blood injected into Dog 76. 
(The dog remained well for 24 days afterwards. Its temperature, taken 
twice daily, remained normal. The dog was not immune for 
pathogenic H. leachi, some were placed on it and it died of piro- 
plasmosis on the 20th day after tick-infestation commenced.) 
(20. in. 03.) 50. Jackal has up to the present shown no fever. 
The jackal’s temperature was taken once a day beginning with day 6, twice a day beginning 
with day 23, excepting on three days when it was taken once; on five days the tem¬ 
perature was not taken. The temperature remained normal throughout, varying from 
100 to 103-2° F. The latter reading was only obtained once, two days after the 
inoculation with blood, otherwise the temperature usually varied between about 101’4 
and 102 , 6° F. 
Controls: see note under Day 1. 
Experiment II .—The jackal used in this experiment was a young animal which had been 
brought to the experiment station about November, 1907. It was inoculated on 
January, 1908, with supposedly infected blood, but the blood was avirulent, since it 
failed to infect control dogs. A second experiment was made on this animal lasting 
from 6 May to 23 May, 1908. 
Day 
(6. v. 08.) 1. The jackal was inoculated with 10 c.c. of virulent blood (from a fatal 
case) diluted with citrate. 
Temperature, °F 
a.m. 
p.m. 
2. 
104-4 
102-2. 
3. 
104 
103. 
4. 
103 
103-6. 
5. 
103-2 
103. 
6. 
103-2 
102 -2. 
7. 
102-6 
104. 
8. 
102-6 
103. 
9. 
103 
104. 
Jackal normal. No parasites in blood. 
10. 
103 
104-4. 
11. 
103 
104. 
Jackal quite normal. 
12. 
102 
103-2. 
13. 
103 
103-4. 
All hope of piroplasmosis infection abandoned. 
14. 
103 
104. 
15. 
102-6 
101-6. 
Given heavy dose of atoxyl chiefly to see if the 
16. 
104 
103. 
jackal would survive it. 
17. 
101 
— 
18. 
— 
— 
Died of atoxyl (arsenical) poisoning. 
Controls: Three control dogs received 5 c.c. each of the same blood of which the jackal 
received 10 c.c. On the 9th day the dogs had developed fever, on the 11th two control 
dogs died. The record omits to mention what occurred in the case of the third dog, 
presumably it also died. 
Result: These two experiments seem to indicate that jackals are 
immune to South African piroplasmosis. The possibility, however, 
