127 



Balfour ( A.) . The Future o£ Research in Tropical Medicine : FaciUties 

 in Mauritius.— 7?^//. Med. JL, London, no. 3153, 4th June 1921, 

 pp. 834-835. 



The advantages and facilities for entomological research work in 

 Mauritius are discussed, and suggestions are made for work on problems 

 still requiring elucidation. 



Cleland (J. B.), Bradley (B.) & MacDoxald (W.). Further 

 Experiments in the Etiology o£ Dengue Fever. — JL of Hyg., 

 Cambridge, xviii, no. 3, October 1919, pp. 217-254, 9 charts. 



The conclusions reached in previous observations are reviewed 

 [R. A.E., B, iv, 196 ; vi, 213 ; vh, 61]. The experiments with Culex 

 fatigans and Stegomyia fasciata described in the present paper support 

 the theories suggested in the earlier papers with regard to the relation 

 of these mosquitos to dengue fever. 



S. fasciata is clearly capable of carrying the infection ; C. fatigans 

 is probably not a vector of the disease ; and experiments with 

 Ochlerotatus {Cidicelsa) vigilax were inconclusive. 



Much information is given with regard to the virus of the disease, 

 its nature, period of incubation and infectivity, distribution in the 

 blood, and transmission by injection. A detailed report of the cases 

 dealt with in the series of experiments is appended. 



Buxton (P. A.). Carriage oJ Coliform Bacilli by the Oriental Hornet 



( Vespa orientalis, Fabr.). — -//. of Hyg., Cambridge, xix, no. 1, 

 July 1920, pp. 68-71. 



Vespa orientalis, F., frequents butchers' shops and fruit shops, and 

 also feeds on faeces, carrion and all sorts of house refuse in Mesopo- 

 tamia. Examination of the gut contents led to the conclusion that 

 this wasp is nearly as heavily infected with pathogenic coliform 

 organisms as the house-fly [Musca domestica], but as it rarely invades 

 kitchens and mess-rooms, it is probably of slight importance. 



Gill (C. A.). Malaria in England, with special reference to the Role 

 of Temperature and Humidity. — //. of Hvg., Cambridge, xix, 

 no. 3, January 1921, pp. 320-332, 1 map. ' 



In India the transmission of malaria appears to be chiefly confined 

 to periods when the monthly mean temperature is not less than 61° F., 

 and the monthly mean relative humidity not less than 63 per cent, 

 (as measured at 8 a.m.). 



As the humidity in England is never below 70 per cent., the tem- 

 perature should be the sole factor limiting infection. It is only during 

 July and August, and only in certain parts of the country, that the 

 mean temperature reaches 61° F. It was found that in areas in which 

 the mean is over 62° F., 86-6 per cent, cases occurred; in areas of 

 61°-62°, 10-4 per cent, cases occurred; in areas of 60°-61°F., only 

 3 per cent, cases occurred ; and no cases occurred in areas under 

 60° F. These findings favour the author's conclusions as to the influence 

 of meteorology on malaria in India [R. A.E., B, ix, 86]. 



