Application and Use of Larvicides

At the Conference held at Birnagar in February 1929 to discuss the problem of malaria in that town, I submitted a proposal for concentrating attack upon Anopheles philippinensis which was found to carry malarial parasites in Nature in the Nadia District. In preference to a general campaign against anophelines, Sir Malcolm Watson, who presided at the meeting, accepted the view that the breeding grounds of A. philippinensis should be located in co-operation with the Public Health Department, Bengal, and dealt with by larvicides, but suggested at the same time that the campaign against other anopheline species breeding in numerous other tanks and pools at Birnagar should be continued. It must be admitted that our knowledge of the carrier species at Birnagar was inadequate at that time and he was fully justified in supporting the continuance of a general campaign of oiling which had been our aim at the beginning. I have explained in my previous reports that this " general campaign" was, in practice, of a restricted nature owing partly to the public opposition and partly to the in-