M 148
At first the labour force was housed in matsheds made of bamboo and thatch, with four rows of sleeping benches, two on each side. Later on these were replaced by buildings of a permanent type with similar sleeping arrangements. The number of labourers varied from 390 in February to 671 in December.
Table XIII gives the monthly population, race distribution, and incidence of malaria and details. Up to June catching was done by the Inspectors, each line was searched from end to end with the aid of an electric torch. On a few occasions the space below the lower sleeping bench was cleared and searched, but no great additions to the catch were thus procured. The mosquitoes were obtained resting on clothes, mosquito nets and walls of the buildings; they favoured the matshed lines and comparatively few were caught in the permanent lines until screening was done, the permanent lines being much better lighted and ventilated, consequently less attractive as day resting places.
From June onwards two of the labour force who had been taught this work did the catch, brought the results to the Bureau and until October, brought the blood films taken from the sick. These coolies slept in tents in the ravines in which the two sections of the Camp were situated, about 50 yards below each section. They were provided with catching apparatus and torches. Catching was done in the tents for one hour before bedtime and again at dawn. When not engaged in catching they remained under the net. Occasional visits were paid at night by the local staff to the tents and once a week an Inspector did morning catch in the lines as a check.
In June there was no appreciable difference between the results of the two tent catches, so the tent in B2 was moved to a spur by the side of stream D on the right bank of the Shing Mun. About double the number of A. jeyporiensis were caught in this tent afterwards as compared with the other, so it would appear that these mosquitoes were mainly coming down the Shing Mun Valley as had been suspected.
Tables XIV and XV show records of Anopheline catches. A male Harpagomyia genurostris was obtained in the tent catches, also C. sinensis, and C. whitmorei, hitherto not met with, and C. sitiens. C. sitiens was obtained in June. Formerly the larvae had been found in pools of water, in boats lying on the beach, but elsewhere it is said to breed in brackish water by the sea. It would appear then, that these specimens came from Gin Drinkers Bay, over 1 mile distant.
During the eleven months over 33,000 Anophelines were captured and over 16,000 dissected. The largest monthly catch was in July. Details are shown in Table XVI. As at Wo Li Hop A. jeyporiensis were the most numerous; during some months its infection rate was considerably lower than that of A. minimus, but taken over the eleven months' period there was not so much difference.
M 148
At first the labour force was housed in matsheds made of bamboo and thatch, with four rows of sleeping benches, two on each side. Later on these were replaced by buildings of a permanent type with similar sleeping arrangements. The num- ber of labourers varied from 390 in February to 671 in December.
Table XIII gives the monthly population, race distribution, and incidence of malaria and details. Up to June catching was done by the Inspectors, each line was searched from end to end with the aid of an electric torch. On a few occasions the space below the lower sleeping bench was cleared and searched, but no great additions to the catch were thus procured. The mosquitoes were obtained resting on clothes, mosquito nets and walls of the buildings; they favoured the matshed lines and comparatively few were caught in the permanent lines until screening was done, the permanent lines being much better lighted and ventilated, consequently less attractive as day resting places.
From June onwards two of the labour force who had been taught this work did the catch, brought the results to the Bureau and until October, brought the blood films taken from the sick. These coolies slept in tents in the ravines in which the two sections of the Camp were situated, about 50 yards below each section. They were provided with catching apparatus and torches. Catching was done in the tents for one hour before bedtime and again at dawn. When not engaged in catching they remained under the net. Occasional visits were paid at night by the local staff to the tents and once a week an Inspector did morning catch in the lines as a check.
In June there was no appreciable difference between the results of the two tent catches, so the tent in B2 was moved to a spur by the side of stream D on the right bank of the Shing Mun. About double the number of A. jeyporiensis were caught in this tent afterwards as compared with the other, so it would appear that these mosquitoes were mainly coming down the Shing Mun Valley as had been suspected.
Tables XIV and XV show records of Anopheline catches. A male Harpagomyia genurostris was obtained in the tent catches, also C. sinensis, and C. whitmorei, hitherto not met with, and C. sitiens. C. sitiens was obtained in June. Formerly the larvae had been found in pools of water, in boats lying on the beach, but elsewhere it is said to breed in brackish water by the It would appear then, that these specimens came from Gin Drinkers Bay, over 1 miles distant.
sea.
During the eleven months over 33000 Anophelines were cap- tured and over 16000 dissected. The largest monthly catch was in July. Details are shown in Table XVI. As at Wo Li Hop A. jeyporiensis were the most numerous; during some months its infection rate was considerably lower than that of A. minimus, but taken over the eleven months' period there was not so much differences.
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