SUGGESTIONS FOR FUTUEE WORK. 287 



" 5. As many examinations [as possible] of the blood and fluids 

 in the body-cavity of the Tsetse-flies should be made and the 

 result noted. Injections of fluids in which several flies have 

 been mashed up might also give results. 



" 6. How long do the hiematozoa retain their vitality in the 

 body of a dead animal ? 



" 7. How long do the htematozoa retain their vitality in 

 ordinary pond water ? 



"8. The Fly Disease in the native sheep and goat has to be 

 worked up. I have up to the present been unable to procure 

 these animals from the natives here. 



" 9. Further information is wanted regarding the breeding of 

 the Tsetse-fly. 



" 10. Are the young of animals afiected by the ' Fly' in any 

 way immune to the disease 1 



"11. Sir Walter Hely-Hutchinson informs me that he has 

 heard it stated that animals can be rendered immune to Tsetse 

 by taking them into the Fly when young, at intervals. Is there 

 any truth in this statement 1 



" 12, Will the passage of the parasite through a series of 

 animals influence its morbific power ? 



" 13. Would lai'ge quantities of the serum of wild animals, 

 say the wildebeeste, have any influence on the course of the 

 disease if injected under the skin or into the peritoneal cavity of 

 the animal afiected by the disease 1 



" 14. Can anyone study the disease in tamed wild animals, 

 for example the koodoo or any of the smaller buck ? . - 



" 15. Why should the wild animals be spared whilst tame 

 animals sufifer 1 What is it in domesticity that removes immiftiity 1 

 Can the domestic animal be supplied with what is present in the 

 wild 1 Can this something be discovered 1 



" These, then, are a few of the problems to be solved in the 

 ' Fly ' question . . ." (pp. 68-69). 



APPENDIX B. 



" A Note on the ' Tse-Tse ' Flies op the British Centeal 

 Africa Protectorate." By Captain Richard Crawshav. 



The following " Note," which refers mainly to Glossina mmsitans, Westw., 

 and Gl. pallidipcs, Austen, was kindly written at the author's request 

 by Captain Richard Crawshay, during a sojourn in London in Juno, 

 189G, on his return from Nyasaland. 



" 'Tse-Tse' were formerly met with almost everywhere through- 

 out what is now known as the B. C. A. Pi'otectorate ; but of late 



