1910.] 
Date. 
x * 
oO. 
fy 
ct 
a 
Glossina palpalis on Trypanosomeasis. 
347 
Table IL.—Glossina palpalis and Trypanosoma gambiense. 
No. of No. of fli 
Expt. No. | hours or days after | ~.°..° A a" Result. 
infected feed. aang 
Pere 1545 1 hour il + 
nee 1546 2 hours 1 + 
a 520 rian 2 pe 
ca 1547 ies i zu 
ie 1681 1 day 3 = 
Senctte 1756 2 days 3 + 
1723 ane 15 of 
eee 1713 : ae 10 - 
Be 1783 psy 1l — 
ae 1752 6 10 _ 
tiene 1721 ress 1 ~ 
ines 1906 Stat 2 — 
Ps 1788 Qi 10 es 
a Was ca 1909 Oi 1 - 
ee 1795 10s 8 ee 
spa 1799 One ss 8 a= 
ae 1911 107+ 5; 1 ~ 
on 1913 i, Ws 2 ius 
aoe 1923 ilies 1 es 
1807 ieee 5 = 
ea 1864 ‘eee 30 cs 
es, 1905 AN oa 2 - 
es 1781 Riss 1 es 
Pees 1865 LGy 1%; 12 — 
Pa. 1838 eae 34 as 
Nate 1872 Ze es 12 -- 
Leg tite 1939 iy A 1 ~ 
ae 1873 1s 12 = 
Ao 1940 ES ans 2 oa 
feats 1877 2047 12 _ 
ee 1951 20 ,, 1 a 
oe 1879 Si 20 = 
noe 1886 ous 15 =: 
dohere 1887 DAN. 10 _ 
ee, 1958 24, 1 + 
ee 1889 Be 5 22 ae 
sree 1749 fey ay 1 = 
aris 1759 28 e, 1 + 
WieaN 1866 30, 1 + 
he 1884, ae 1 = 
eee 1897 Sock 2 a 
aie 1907 Sib ess i — 
ee 1885 42, 1 = 
Bea 1791 46 ,, 2 + 
ue 1881 49 1 = 
1898 Sin 1 = 
caer 1856 53 1 — 
Incubation 
period 
in monkey. 
7 days 
7 
99 
12). 55 
Dh ig; 
12) ..3, 
Remarks.—In these experiments the intestines only of the infected flies were inoculated. In 
the experiments marked with an asterisk the gut was first proved, by microscopical examination, 
to contain swarms of living Trypanosoma gambiense, and then immediately injected into a 
monkey. 
It will be seen there are 47 experiments in which a total of 296 laboratory-bred 
flies were inoculated, subcutaneously, into monkeys at various intervals after the flies had fed 
upon blood infected with Trypanosoma gambiense. 
one, two, and four hours after an infected feed, caused Sleeping Sickness. Three flies inoculated 
two days after their infected feed produced a like result. Between the 2nd and the 24th days 
The injection into a monkey of a single fly, 
