number of infected individuals amongst the changing population. 



Examination of the parasites found in the blood of birds showed 

 about 50 per cent, of those examined in August to be infected. Halter i- 

 dium danilewski was found in 12 '4: per cent, of cases, Leucocytozoon 

 in 3 '4 per cent, and Proteosoma in l"? per cent. 



The second expedition in 1905 was undertaken to rilenlcovo, 

 Vesselaya and surrounding localities, which are regarded as important 

 foci of malaria, the large majority of the population liaving been 

 attacked. Owing to use of quinine in the first of these, the cases 

 w^ere less severe and the percentage of infested mosquitos was lower. 

 Parasites were found in 81 6 per cent, of the primary cases and in 

 45 per cent, of the relapsing ones. Most of the patients suffered 

 from the pernicious form of malaria, the tertian and quartan forms 

 being less common. Mixed infections, the number of cases of which 

 was 32, were Plasmodium vivax and P. malariav, 25 : P. vivax and 

 P. praecox, 3 ; P. mxdariae and P. praecox, 2 ; P. vira-x, P. malariae and 

 P. praecox, 2. 



The predominant species of mosquito was Anopheles inaculipennis, 

 Meig., A. bifurcatus being only found occasionally. 



Examinations of mosquitos as regards infection witli parasites 

 were carried out on a large scale. An average of 6 4 per cent, of mos- 

 quitos proved to be infected, the figure varying from 3 per cent, in 

 Pilenkovo and 8*2 per cent, in Vesselaya to 25 per cent, in the environs 

 of the first locality. The highest percentage of infected mosquitos 

 was found in September, when there was also the greatest number of 

 cases of malaria. 



The Culicines were chiefly represented by Culex pipietis, though 

 some other species were also present ; about 3 '8 per cent, of these were 

 infected with non-malarial parasites, such as filaria and crithidia. 

 A table showing the parasites found in the blood of various birds and 

 other animals is given, followed by some discussion on their morphology. 



Short resumes in French are appended to these reports. 



Marzinovsky (E. I). Bopb6a ctj MannpieH h o5mecTBeHHbm opra- 



HMSai^JM. [Public Organisations and The Control of Malaria.] 

 — Published by the Pirogov Malaria Commission, Moscow, 1916, 

 18 pp., 3 tables of figs. 



This is a popular account of the causes and control of malaria and of 

 the part which can be played m the campaign against mosquitos by 

 various public organisations. 



Robertson (M.). Report upon the Present Condition of the Siroko 

 Valley.— M./S. Colonial Office Report. Dated 21st January 1914. 

 [Received 19th May 1917.] 



In the Siroko Valley, on the west side of Mount Elgon in Uganda, 

 there are three narrow strips of forest infested with Glossina palpalis, 

 which he along parts of three rivers, and the fly is also found 

 in two swampy forest patches m connection with the Siioko 

 River. In the upper part of these rivers the fly does not occur, 

 although the vegetation is apparently in many places well adapted 

 to its existence. It seems as though the increased height and the 

 close proximity to the mountain produces some condition, probably 



