M 158
(6) Site of Former Military Sanitorium at Magazine Gap.
Several visits were paid to this site. Recommendations were made regarding the repair and upkeep of drainage in the neighbourhood already in existence. The question of extension of drainage was raised.
(7) Proposed Site for Cantonments at Po Kong.
A larval survey was commenced on the 26th September and finished on 29th December. The area dealt with included the above site and half a mile outside its periphery. It also included half a mile radius round the Royal Air Force Aerodrome. The proposed Cantonment area is flat cultivated land. To the South is the Air Port and the sea. To the North, East and West are hills between whose spurs streams run seawards. In the cultivated areas the larvae of A. hyrcanus predominated although larvae of A. minimus were found in irrigation ditches and the hill streams, A. minimus and A. maculatus were numerous, the majority being obtained in the neighbourhood of the hills. Larvae of A. jeyporiensis abounded in the fallow rice fields near the Rifle Range. In this vicinity at Chuck On in 1928 a company of 200 troops went into camp. Owing to malaria—80 cases in one month—the camp was abandoned. A few catches were done in a matshed near Kai Tak Aerodrome. Results are shown in Table XXI. One A. jeyporiensis was found to be heavily infected in the midgut, and a labourer whose blood was taken had been living there for a month who appeared to have contracted malaria there. A preliminary report with map attached was submitted.
(8) Repetition of Surveys at Taikoo Sanitorium.
In December, 1932, 16 larvae of A. maculatus and 19 A. minimus were found in a brick and cement tank 6 feet square near the site of the former Taikoo Sanitorium. The tank was fed by a seepage trickling from the rocks and overflowed into a concrete channel. The site is approximately 1,200 feet above sea level, one mile as the crow flies from the nearest habitation and 21/4 miles by road. No one had been living on the site since 1930. During 1933 the tank was inspected monthly—February, May, September excepted. No larvae were collected until November when 28 A. maculatus were found. In December 15 A. maculatus and one larva of A. minimus were collected. Tadpoles were noticed on most occasions. Two of these were captured and kept alive for weeks in the laboratory, but did not eat Anopheline larvae which were offered to them. Furthermore, tadpoles were present in the tank when larvae were obtained.
(9) Repetition of Surveys around Site of New Government Civil Hospital.
Larval surveys were repeated at intervals in two ravine streams A north and B south of Mount Davis Road.
M 158
(6) Site of Former Military Sanitorium at Magazine Gap.
Several visits were paid to this site. Recommendations were made regarding the repair and upkeep of drainage in the neighbourhood already in existence. The question of extension of drainage was raised.
(7) Proposed Site for Cantonments at Po Kong.
A larval survey was commenced on the 26th September and finished on 29th December. The area dealt with included the above site and half a mile outside its periphery. It also in- cluded half a mile radius round the Royal Air Force Aerodrome. The proposed Cantonment area is flat cultivated land. To the South is the Air Port and the sea. To the North, East and West are hills between whose spurs streams run seawards. In the cultivated areas the larvae of A. hyrcanus predominated although larvae of A. minimus were found no irrigation ditches and the hill streams, A. minimus and A. maculatus were numer- ous, the majority being obtained in the neighbourhood of the hills. Larvae of A. jeyporiensis abounded in the fallow rice fields near the Rifle Range. In this vicinity at Chuck On in 1928 a company of 200 troops went into camp. Owing to malaria-- 80 cases in one month-the camp was abandoned. A few catches were done in a matshed near Kai Tak Aerodrome. Re- sults are shown in Table XXI. One A. jeyporiensis was found to be heavily infected in the midgut, and a labourer whose blood was taken had been living there for a month who appeared to have contracted malaria there. A preliminary report with map attached was submitted.
(8) Repetition of Surveys at Taikoo Sanitorium.
In December, 1932, 16 larvae of A. maculatus and 19 A. minimus were found in a brick and cement tank 6 feet square near the site of the former Taikoo Sanitorium. The tank was fed by a seepage trickling from the rocks and overflowed into a concrete channel. The site is approximately 1,200 feet above sea level, one mile as the crow flies from the nearest habitation and 24 miles by road. No one had been living on the site since 1930. During 1933 the tank was inspected monthly-February, May, September excepted. No larvae were collected until November when 28 A. maculatus were found. In December 15 A. maculatus and one larva of A. minimus were collected. Tad- poles were noticed on most occasions. Two of these were captured and kept alive for weeks in the laboratory, but did not eat Anopheline larvae which were offered to them. Furthermore, tadpoles were present in the tank when larvae were obtained.
(9) Repetition of Surveys around Site of New Government
Civil Hospital.
Larval surveys were repeated at intervals in two ravine streams A north and B south of Mount Davis Road.
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