201 
TRYPANOSOME TRANSMISSION 
EXPERIMENTS 
BY 
The late J. EVERETT DUTTON, M.B. (Vict.) 
(WALTER MYERS FELLOW, THE UNIVERSITY, LIVERPOOL) 
JOHN L. TODD, B.A., M.D., C.M. McGill 
(DIRECTOR OK THE RUNCORN RESEARCH LABORATORIES OF THE 
LIVERPOOL SCHOOL OF TROPICAL MEDICINE) 
AND 
J. W. B. HANINGTON, M.D., McGill 
(DEMONSTRATOR AND RESEARCH ASSISTANT, LIVERPOOL SCHOOL OF 
TROPICAL MEDICINE) 
Being the Seventh Progress Report of the Expedition of the Liverpool 
School of Tropical Medicine to the Congo, 1903-1905 
(Received April 20th, 1907) 
I. ATTEMPTS TO TRANSMIT TRYPANOSOMES BY 
TSETSE FLIES 
In a short series of experiments done in the Gambia in 1902-3, 1 
we failed to infect animals with Trypanosoma gambiense or 
dimorphon by the bites of captive flies (Glossina palpahs and 
Stomoxys (see h page 40). which were either freshly caught or had 
been fed previously on an infected animal The members of the 
Royal Society’s Commission on Sleeping Sickness in Uganda ha\e 
since succeeded, however, in infecting healthy animals wit 1 
trypanosoma gambiense by the bites of flies (6 lossina palpalis ) e > 
at the most, 48 hours previously on an infected animal (-, page i> 
As a result of this work it has again been maintained ( 13, an 
others) that the tsetse fly is merely a mechanical transmitter o 
trypanosomes, and is not an alternative host in which the parasite 
undergoes definite developmental processes.* 
__ *TJ?‘ S suggestion first emanated from Bruce, but he J^^m^tTryfartosoina 
possibility of there being a developmental process of the trypanosom P 
0rucet ) >o the tsetse fly ( Glossina morsitans) (14, page 4 )- 
