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in the sides weighted by rollers. When in use, the flaps were rolled. At intervals the investigator got up, let down the flaps and searched for mosquitoes with an electric torch. The results are indicated in Table VIII. Considering the proximity to Anopheline breeding grounds and the ease with which numerous larvae could be found therein, the results are not such as would be expected. In the Wong Chok Hang area much better returns were obtained from a number of morning searches in habitations of the matshed type. The reason may be that the Anophelines have a preference for such buildings on account of the dark sheltered hiding places which they afford, in contrast to the garage and the rooms of the Taikoo houses.
No opposition was experienced by the probationers in carrying out this work. The inhabitants of the houses evinced great interest in the proceedings and asked numerous questions as to the reasons for them. They offered every assistance and volunteered suggestions which may be useful in future. Some of these people were using mosquito nets, as a rule these were defective. In the Federated Malay States Chinese coolies in rural areas were seldom found without a mosquito net in good order. No Anophelines were found infected in the course of dissections during the year.
Investigations as to prevalence of malaria in certain areas.
During the year reports upon the surroundings of 180, The Peak, Mr. Y. P. Law's House at Taipo, and Tung Wah Eastern Hospital were completed and recommendations made accordingly. No village children were available for spleen examination in the Peak survey. At Taipo only six children were examined in the village owing to the majority of them being at school. A previous spleen census of schools in Taipo taken in July, 1930 gave a spleen rate of 10%. 46 were examined. No enlarged spleens were found amongst 106 school children in the neighbourhood of Tung Wah Eastern Hospital.
Investigations were undertaken and completed at Shouson Hill, the proposed new Govt. Civil Hospital site, Ngau Tau Kok, and Sham Tseng. 62 children were examined in the villages of Wong Chok Hang and Hong Kong Wai, which are situated between Aberdeen and Shouson Hill. 51 children had enlarged spleens or 82%. In the same area 104 blood films were taken and 14 were positive, or 15.5%.
A preliminary survey around the proposed site for the new Govt. Civil Hospital done in April resulted in the finding of larvae of A. maculatus and a few A. minimus. A more complete survey was done in July and August, and only larvae of A. maculatus found, and these in abundance. It is remarkable that no complaints have arisen on the score of mosquito nuisance alone. Looking at the map of the larval survey, if the energetic
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in the sides weighted by rollers. When in use, the flaps were rolled. At intervals the investigator got up, let down the flaps and searched for mosquitoes with an electric torch. The results are indicated in Table VIII. Considering the proximity to Anopheline breeding grounds and the ease with which numerous iarvae could be found therein, the results are not such as would be expected. In the Wong Chok Hang area much better returns were obtained from a number of morning searches in habitations of the matshed type. The reason may be that the Anophelines have a preference for such buildings on account of the dark sheltered hiding places which they afford, in contrast to the garage and the rooms of the Taikoo houses.
No opposition was experienced by the probationers in carry- ing out this work. The inhabitants of the houses evinced great interest in the proceedings and asked numerous questions as to the reasons for them. They offered every assistance and volun- teered suggestions which may be useful in future. Some of these people were using mosquito nets, as a rule these were defective. In the Federated Malay States Chinese coolies in rural areas were seldom found without a mosquito net in good order. No Anophelines were found infected in the course of dissections during the year.
Investigations as to prevalence of malaria in certain areas.
During the year reports upon the surroundings of 180, The Peak, Mr. Y. P. Law's House at Taipo, and Tung Wah Eastern Hospital were completed and recommendations made accord- ingly. No village children were available for spleen examination in the Peak survey. at Taipo only six children were examined in the village owing to the majority of them being at school. A previous spleen census of schools in Taipo taken in July, 1930 gave a spleen rate of 10%. 46 were examined. No enlarged spleens were found amongst 106 school children in the neighbour- hood of Tung Wah Eastern Hospital.
Investigations were undertaken and completed at Shouson Hill, the proposed new Govt. Civil Hospital site, Ngau Tau Kok. and Sham Tseng. 62 children were examined in the villages of Wong Chok Hang and Hong Kong Wai, which are situated be- tween Aberdeen and Shouson Hill. 51 children had enlarged spleens or 82%. In the same area 104 blood films were taken and 14 were positive, or 15.5%.
A preliminary survey around the proposed site for the new Govt. Civil Hospital done in April resulted in the finding of larvae of A.. maculatus and a few A. minimus. A more com- plete survey was done in July and August, and only larvae of A. maculatus found, and these in abundance. It is remarkable that no complaints have arisen on the score of mosquito nuisance alone. Looking at the map of the larval survey, if the energetic
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