THE INFLUENCE OF DROUGHT UPON MOSQUITO LIFE IN SURREY. 209 



rare in this locality during future years. Predictions were made by several jieople 

 at the beginning of the hot weather that there would probably be an encnnious 

 increase in the number of mosquitos all over the country, and that in consequence, 

 with the large numbers of ex-soldiers in our midst who had suffered from malaria, 

 we should probably see many new cases of indigenous malaria. The reverse has 

 been true. I learn from the Ministry of Health that the number of cases of 

 indigenous malaria contracted in England in 1920 was 36; whereas in 1921, up to 

 the 29th August, only four cases had been recorded. Hot weather is obviously 

 only one of the many factors in the malaria equation. Even in England, where 

 it had been maintained that the historical epidemics of malaria have been occasioned 

 by a hot summer following the return of malaria-infected troops from abroad, it will 

 be clear that this combination is not all that is necessary to produce even a mild 

 epidemic of indigenous malaria. 



