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76. Of these measures, in 1933, works of a permanent nature were done in the rice swamps (indicated in shading) and in the upper parts of streams A3 and A6 within the 2′′ circle, and, along stream A3a outside this limit. Drainage pipes and rubble surmounted by concrete drains were placed in the narrow rocky bedded streams, C, D, and E. Engineering work was done on that portion of the ravine which runs from Pineapple Pass to Wo Li Hop, and such breeding places of A. jeyporiensis as lay between Pineapple Pass and the P.W.D. Dam along the Shing Mun and its tributaries.
77. The remaining streams and rice fields in the area under treatment, were dealt with by temporary measures. Clearing was done in the streams and the water oiled; drainage in the fallow rice fields, and oiling of these drains within the half mile circle.
78. In 1934 an anti-malarial gang of ten coolies oiled and kept clear the streams, and made such ditches as were necessary. A mixture of 1% Paris Green with Green Island Cement dust was used on breeding places in wet cultivation north of the Access Road. This work was supervised by the Resident Medical Officer assisted by two anti-malarial Inspectors who resided on the spot. Blood films were taken, stained, examined and reported upon by them and when time permitted minor larval surveys were done and searches for fresh breeding places were made.
79. In 1933 over 33,000 Anophelines had been captured in the coolie lines, 75% of the catch being A. jeyporiensis which had an infection rate of 10% in over 10,000 dissections, hence this Anopheline was considered to be of primary importance. The larvae had been found in fallow rice fields so that a special look-out was kept for such breeding places.
80. Early in the year surveys were done in the streams around the matsheds occupied by the coolies of the Wolfram Mining Camp, the site of which is indicated on the map, east of the Shing Mun river. The larvae taken were nearly all A. maculatus; no flooded rice fields were then found in the vicinity nor later in the year when the A. jeyporiensis catch in the Camp had gone up considerably.
81. In 14 morning catches done at Wolfram Camp matsheds during the second half of the year only eleven Anophelines were captured, however two of these were found to be infected. At the end of the year about 350 labourers resided in this Camp.
82. On the Eastern bank of the Shing Mun searches were made from the neighbourhood of the village of Ho Pui to the swampy ravine at the head of stream A2 east of the Aqueduct, but no breeding grounds of A. jeyporiensis were met with.