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seven gaol admissions contained microfilaria. These were taken in the day-time. Material consisting of thick blood films containing microfilaria, and preparations of filaria from the mosquitoes, have been forwarded to Dr. R. Hoeppli, Peiping Union Medical College, for investigation and report.
(c) CATCHING AND DISSECTING OF ANOPHELINES FOR MALARIAL INFECTION.
(1) Wong Chuk Hang Village & Surroundings.
Night catching by trapping was done during January in an empty garage on the outskirts of the village where a spleen rate of 82 per cent had been obtained in 1931 by the Acting Malariologist amongst 62 children examined in the locality. The investigator slept upon a camp bed protected by a mosquito net, outside this was a larger mosquito net supported on four poles. This larger net had flaps in the sides weighted by rollers. When in use the flaps were rolled up. At intervals, the investigator got up, let down the flaps and searched for mosquitoes with an electric torch. On 22nd January a visit was paid to the locality and five A. minimus gorged with blood were found in huts. These huts are thatched with palm leaf which also enters largely into the composition of the walls. Night catching was discontinued at the garage but was resumed again in May in a room of a house owned by Mr. Li who kindly placed it at the disposal of the Bureau, and the trapping apparatus was transferred there from the garage. In July an I.P. tent was pitched near the house and a coolie engaged to look after it, sleep in it and catch mosquitoes. Streams which had been found to harbour Anopheline larvae especially those of A. maculatus and A. minimus were close to and on all sides of the house and tent. Night catching was done on Monday, Tuesday, and Wednesday of each week by the probationers in turn.
The tent was inspected on arrival at 8 p.m. to ascertain if the coolie was at his post and occasionally during the night. Catching was done at intervals until midnight in house and tent and the coolie then brought up his catching bottle and its contents to the house. Between midnight and dawn another catch was made and again before daylight. The coolie was provided with camp bed, mosquito net, alarm clock and electric torch; when not actually catching he remained inside the net. His blood has been examined on five occasions at monthly intervals: neither microfilaria nor malaria parasites were found, although these were present in local people. Mosquitoes with one or other of such infections have been captured by him in the tent from time to time, so that it would appear that A. minimus does not confine its visits to one habitation. The probationer on duty brought the results of the night catches to the Laboratory on Tuesday, Wednesday and Thursdays mornings; on other days of the week except Sundays and holidays, morning catches were
M 132
seven gaol admissions contained microfilaria. These were taken in the day-time. Material consisting of thick blood films con- taining microfilaria, and preparations of filaria from the mos- quitoes, have been forwarded to Dr. R. Hoeppli, Peiping Union Medical College, for investigation and report.
(c) CATCHING AND DISSECTING OF ANOPHELINES FOR MALARIAL INFECTION.
(1) Wong Chuk Hang Village & Surroundings.
Night catching by trapping was done during January in an empty garage on the outskirts of the village where a spleen rate of 82 per cent had been obtained in 1931 by the Acting Malario- logist amongst 62 children examined in the locality. The in- vestigator slept upon a camp bed protected by a mosquito net, outside this was a larger mosquito ne: supported on four poles. This larger net had flaps in the sides weighted by rollers. When in use the flaps were rolled up. At intervals, the investigator got up, let down the flaps and searched for mosquitoes with an elec- tric torch. On 22nd January a visit was paid to the locality and five A. minimus gorged with blood were found in huts. These huts are thatched with palm leaf which also enters largely into the composition of the walls. Night catching was discontinued at the garage but was resumed again in May in a room of a house owned by Mr. Li who kindly placed it at the disposal of the Bureau, and the trapping apparatus was transferred there from the garage. In July an I.P. tent was pitched near the house and a coolie engaged to look after it, sleep in it and catch mos- quitoes. Streams which had been found to harbour Anopheline larvae especially those of A. maculatus and A. minimus were close to and on all sides of the house and tent. Night catching was done on Monday, Tuesday, and Wednesday of each week by the probationers in turn.
The tent was inspected on arrival at 8 p.m. to ascertain f the coolie were at his post and occasionally during the night. Catching was done at intervals until midnight in house and tent and the coolie then brought up his catching bottle and its con- tents to the house. Between midnight and dawn another catch was made and again before daylight. The coolie was provided with camp bed, mosquito net, alarm clock and electric torch: when not actually catching he remained inside the net. His blood has been examined on five occasions at monthly intervals: neither microfilaria nor malaria parasites were found, although these were present in local people. Mosquitoes with one or other of such infections have been captured by him in the tent from time to time, so that it would appear that A. minimus does not confine its visits to one habitation. The probationer on duty brought the results of the night catches to the Laboratory on Tuesday, Wednesday and Thursdays mornings on other days of the week except Sundays and holidays, morning catches were
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