38 



and cerebro-spinal fluid of man and monkeys : that the 

 Trypanosoma is carried from the sick to the healthy by the 

 biting of a distinct species of Tsetse-fly {Glossina palpalis), 

 and that the occurrence of the disease coincides with the 

 distribution of this particular species of fly. Dogs and rats 

 are only partially susceptible to inoculation, but efforts to 

 innoculate guinea-pigs, donkeys, oxen, goats, and sheep 

 have so far yielded negative results only. 



And now, in conclusion, a few more words concerning our 

 own Society. One very noticeable feature of the last few 

 years is the large extent to which photography has been 

 brought to our aid. I do not intend to speak upon this 

 subject in general, because that was done last year by my 

 predecessor, who I may almost describe as a life-long photo- 

 grapher, whilst some of us can only claim a few years' 

 acquaintanceship with the camera. What I regard as most 

 important in the photographic exhibits here during the past 

 year are the contributions to the life-histories of insects illus- 

 trated by the camera, especially those of larvai and pupae 

 shown by Messrs. Main and Goulton, and the very beautiful 

 ova photographs of those gentlemen and Mr. Tonge. It has 

 been decided by the Council to solicit prints of many of 

 these photographs, and I have no doubt that before long a 

 definite scheme for their preservation in albums accessible 

 to members will be prepared. I feel quite certain that 

 photography is destined every year to play a more important 

 part in the work of the naturalist, and I quite look forward 

 to see nearly all works on natural history illustrated by its 

 aid. Everybody knows how often in the past the work of 

 artists, who have illustrated our scientific works, has been 

 spoiled by engravers and colour-printers who have not 

 understood what they were reproducing, and who have failed 

 to realise the importance of truthfully preserving every detail 

 of the original design. We also want a wider use of the 

 camera in the field, though, of course, there are many 

 branches of natural science in which this is almost impos- 

 sible. The specimen posed in the studio makes a more 

 attractive picture, but when we can succeed in getting 

 photographs of the creatures at liberty and in their natural 

 habitat, I think they will have a greater scientific value than 

 those of bred examples under more or less artificial condi- 

 tions. There have been almost endless portraits published 

 of the well-fed animals at the Zoo ; but I should like to 

 know that the sportsman of the future, instead of journeying 

 to far countries armed with a gun to help in the rapid exter- 



