M 136
in Old and New Shek O Villages. Two A. minimus were found in two houses of Old Shek O, but in New Shek O no mosquitoes were found in the village houses, which were searched as far as the temple on the occasion of the spleen survey. No mosquitoes were found in the cow sheds of the village but these were fairly well lighted and ventilated. The blood of fifty servants was examined. One Club servant was actually suffering from malaria at the time and stated that he had been taking quinine, yet parasites were found without difficulty in the thick drop film, although none could be demonstrated in the thin film. During the course of erection of a new residence, a considerable number of workmen had been housed in the locality. As the majority do not use mosquito nets, they may be considered an important factor in the introduction and spread of malaria where suitable Anophelines are present.
Lai Chi Kok Gaol,
Owing to the incidence of malaria there during the latter half of the year, a visit was paid to the Gaols for both male and female prisoners and the surroundings inspected. Arrangements have been made for a complete survey; in the meantime, certain recommendations have been proposed for consideration.
Shing Mun Dam.
Visits have been paid in November and December to the proposed camp site for the labourers who will be engaged at work on the Dam, and to the site for European residences. Larval surveys have been done around them. From investigations made, there has been a considerable amount of malaria in the Village of Woo Li Hop and amongst the contractor's coolies, engaged on making the road to the Dam, who were housed close to the village; steps have been taken with a view to making the Dam site healthy. Results of examinations for enlarged spleens and malarial parasites are given in Table XV and XIV.
Repetition of Pokfulam Ravine Survey.
During August, a larval survey was repeated in the upper part of the stream which flows into Pokfulam Reservoir and which lies in the ravine below the Peak Hotel and Peak Mansions. The stream was searched as far as its junction with the branch from Mount Austin Barracks and all the included tributaries as well. As in December 1931, very few Anopheline larvae were met with, only 12 A. maculatus in the whole area. It is hoped to repeat the survey in 1933 after the rains, as numerous potential breeding places were present, and malarial infections have been recorded from the locality.