234 ■ F. W. DRY. 



Ten cases of trypanosomiasis were proved from blood-slides, all taken previous 

 to the 6th April, and eight of the oxen were still alive at the time of my visit. 



After my visit tlie mortality ceased. No more cases of the disease were detected, 

 and all animals proved to be infected were slaughtered in order to bring the outbreak 

 to a close. 



It should here be mentioned that two farmers resident for some years in the district 

 told me that when cattle are brought from other parts of the country to poor grazing 

 of the sort on this farm and worked hard, as the oxen had been, there is great risk of loss. 

 This, it seemed, might be the explanation of some of the deaths. With the fact, 

 however, that, in all, ten cases of trypanosomiasis were proved, and that no other 

 disease had been demonstrated on the farm, the presumption certainly is that some 

 of the fourteen deaths of which the cause was not known were due to trypanosomiasis. 



There were no signs of the disease amongst the small number of cattle owned by 

 Lumbwa on the farm. The European and native owned animals were kept away from 

 each other. 



The European owned oxen had all been bought from dealers, two European 

 and two Indian. Those obtained from the European dealers had been through the 

 Kibigori Quarantine Station, to which animals were taken from widely separated 

 sources ; those from Indians had probably come out of the Lumbwa Reserve. 



Of the ten animals proved to have trypanosomiasis two had been purchased 

 from one European dealer, two from the other, and the remainder from one or 

 other of the two Indian dealers. A sufficiently accurate record had not been kept 

 to make it certain whether animals which had the disease had come from one 

 Indian dealer or from both, but the partner on the farm in charge of the cattle felt 

 almost certain that it was from both. At any rate, animals from three out of the 

 four sources had trypanosomiasis, and though there is just a chance that both the 

 European dealers had bought cattle from the same mob from Kibigori, the number 

 of distinct sources from which animals proved to have trypanosomiasis had come 

 is at least two, though it may be four. 



Another point to be noted is that the second animal which was proved to have the 

 disease came on to the farm early in February, having been purchased from one 

 European dealer, after the death, on 1 st February, of the first animal proved to have 

 the disease, which had been bought from the other European dealer. 



One piece of information given to me must now just be mentioned about the 

 possible presence of trypanosomiasis cases other than oxen on the farm. A Dutch 

 manager who had left the farm had had two donkeys. One donkey is believed to 

 have died or been kiUed on the farm in November or December of 1919. The other 

 had been given to a Kericho resident and had subsequently died. This manager 

 was stated to have thought that the donkeys had trypanosomiasis. This 

 evidence is not of a definite description, but is recorded because Captain Cameron 

 inclined to the view that it might have been in these donkeys that the disease was 

 brought on to the farm. 



I collected blood-sucking flies on this farm and on neighbouring land, near to the 

 river known at different parts of its course on the farm boundary as the Saosa, the 

 Dimbilitch, and the Kitho, near to small tributary streams, and on the grazing 

 grounds of the cattle, which were then being kept away from the river. The 

 blood-sucking fly fauna could not be considered a striking one. All such flies 

 captured belonged to the genera Hacmatopota and Stonwxys. Stomoxys were chiefly 

 captured on grazing oxen, often being present in large numbers, while almost all the 

 Haematopota were taken near to the river. 



