318 
Col. Sir D. Bruce and others. 
Antelope as a 
[ Nov. 9, 
The result of .24 experiments carried out on these lines is given in the 
following table :— 
Table II.—Giving the Result of Feeding Laboratory-Bred Flies on Antelope 
Infected with Sleeping Sickness. 
- Result. 
No. of poses Species of No. of days BIG OE Cea mek) 
- | Clean : laorae before flies 
experi-| 4... antelope flies _ flies fed on eons ' Remarks. 
ment. fed on. | antelope. ase ets Posi- | Nega- 
used. infective. | 4. . 
| ive. | tive. | 
2346 | 160 | Bush-buck 2328] 12 29 + Buck 2026) eye ee 
2384 | 100 8 28 x gambiense in blood. In spite 
2414 70 22 6 29 it of this, flies fed on it became 
2501 | 100 4 8 39 in | infected 55 days after the 
a2 | buck’s infection. 
| aa aE peste We S521) i - BF eA Buck 2357 showed 7. gambiense 
2510 | 100 a 5 my ie in its blood for 5 days only. 
2507 | 200 | Reed-buck 2359 6 44 + Buck 2359 showed 7. gambiense 
in its blood for 7 days only. 
2421 50 | Bush-buck 2371 6 — - Buck 2371 showed 7. gambiense 
2477 60 i 6 29 + in its blood for 3 days only. 
2499 | 100 | Bush-buek 2372 | 8 — — | Buck 2872 showed 7. gambiense 
in its blood for 2 days only. 
aioe a ee Ne ee ; oN nf __ {| Buck 23878 never showed 7. 
2559 50 A mn a fis gambiense in its blood. 
ai aa Reed poe es : ee ik Buck 2427 showed Z. gambiense 
9508 100 22 6 30 i in its blood for 4 days only. 
2485 | 50 | Bush-buck 2428 7 28 + Buck 2428 never showed TZ. 
| gambiense in its blood. 
2460 50 | Reed-buck 2429 | 4 27 + | Buck 2429 showed 7. gambiense 
| 2543 | 100 % 6 49 + in its blood for 3 days only. 
| < (| Buck 2431 showed 7. gambiense 
_ 2464 , 55 | Reed-buck 2431 3 28 + | in its blood for 4 days only. 
2544 90 . 6 36 + + In spite of this, flies fed on it 
2592 | 100 5 5 43 + | became infected 81 days after 
| | | its infection. 
| 2476 50 | Reed-buck 2445 4 — - Buck 2445 showed 7’. gambiense 
| aio 
| | in its blood for 6 days only. 
| | 
carried out. 
On glancing at Table II it will be seen that 24 experiments in all were 
Of these, 17 were positive (70°84 per cent.), and seven negative 
(29°16 per cent.). The shortest time which elapsed before the flies became 
infective was 24 days, the longest 49 days, and the average 33°39 days. 
