31 



the following' experience, as possibly pointino- to a method by 

 which flies may be destroj-ed, at all events in certain places. 



At Xid de Yerdier, near Fecamp, in Seine-Inferieure, there is 

 a fish-culture establishment and the Director, having' found bj- 

 experience that the best food for the young- fish was living- fly 

 maggots, and being in need of a reg'ular supply, deposited pieces 

 of waste meat in various parts of the establishment with the 

 object of attracting- the flies and obtaining- the required maggots 

 easily. In this he was successful, but having carried on the 

 method for a comparatively short time he found that it no longer 

 supplied him with food for his young- fish, the reason being 

 apparently that there was not a sufficiency of flies left in the 

 neighbourhood. The author thinks that this simple plan, if 

 widely adopted, might prove of great service in diminishing- the 

 number of flies, that is to say, by providing- definite meat traps, 

 instead of allowing the flies to deposit their eggs in household 

 refuse and the like. 



vScHWETz (J.). Les Glossines et la Maladie du Sommeil dans la 

 Vallee de la Lukuga. [Tsetse-flies and Sleeping- Sickness in 

 the Valley of the Lukuga.] — Archiv fur Schijfs- unci Troyen- 

 Hygiene, xvii, no. 2, 1913, pp. 3T-54, 2 figs. 



AVith the exception of one single river, the Lugumba, all the 

 western affluents of Lake Tanganyika come from the mountains, 

 that is to say, lose their G. paliKilin quite close to the lake, and 

 they are therefore not of much consequence in the dissemination 

 of sleeping- sickness; this is not the case with the Lukuga. 

 Between the western shore of Tanganyika w-here the disease 

 exists and the Lualaba and Luvua Elvers, where the disease also 

 exists, there is an intermediate very mountainous district free 

 from human trypanosomiasis. This reg-ion is free because it is 

 mountainous and 6r. 'palyalis is not found there. A very few 

 sufferers from the disease are to be seen in this area, but they are 

 not dangerous to their neighbours, provided that they do not 

 go down to the river or lake. Communication between Albert- 

 ville and Kiambi merely crosses the Lukuga valley so that 

 caravans going- that waj- are not long exposed to the risk of 

 infection. 



The author describes the river as containing plenty of water, 

 and the vegetation on the banks as luxuriant and offering- plenty 

 of shade. G. palpalis and G. morsitans are found throughout 

 the whole length of the valley, palpalis close to the river and its 

 banks, whilst inorsitans occupies the rest of the valley and the 

 shores of Tanganyika. G. palpalis is far from being- constant. 

 There are places where for a distance of 10 or more kilometres 

 not a single specimen is to be found ; for example, between Albert- 

 ville and the Lukug-a palpalis is not met with until the mouth of 

 the river Lugumba is reached. On the Lukuga itself, however, 

 there is not a yard free from the fly, and the author says that 

 when g-oiug- from the lake as far as Mlang-e they did not give him 

 a moment's rest. The caravan route already mentioned as 

 crossing the river swarms with the fly, but at a comparatively 



