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590. By the middle of the year all possible mosquito breeding places within 3/8ths of a mile from the lines had been destroyed. In spite of this it was still possible to catch in the lines large numbers of adult anophelines showing that the radius of sanitated area was not yet sufficient.
591. As it was unlikely that the extension of an additional 1/8th mile would prevent the access to the lines of all anophelines and as it was impossible to predict with certainty how much further it would be necessary to go, the Medical Authorities recommended mosquito nets or proofing the lines.
592. Single nets were tried but proved a failure. It was then decided to screen the windows and doors with fourteen mesh copper gauge. This mesh had in the laboratory proved impervious to all anophelines.
593. As so often happens in cases where attempts are made to screen houses which have not been designed with a view to that end, the result was only a partial success; in fact, some lines became excellent mosquito traps. Whereas previous to screening, Anopheles hyrcanus was rarely captured in considerable numbers. They found their way in but could not find their way out.
594. By the end of the year, all the area up to the half-mile circle had been cleared of breeding places. Anophelines, however, continued to be caught in the lines, showing that under the conditions prevailing, the range of flight and therefore the limit of safety exceeds half a mile.
J
595. The anti-mosquito measures taken by the medical staff included oiling and paris-green application to the breeding places and the catching of adult mosquitoes in the lines. The catching of large numbers of mosquitoes, each of which is a possible medium of spread of malaria, must have a beneficial effect, and it is probable that mosquito catching in the lines was of considerable value in preventing a rise in the incidence rate.
596. A detailed account of the anti-mosquito work done by the staff under the control of the Malariologist is contained in his annual report, which will be found in the appendix.
597. The following data, supplied by the Resident Engineer, shows the extent of the very important anti-malaria engineering works carried out by his staff.
(1) 326 acres cleared of brushwood, etc.
(2) 61 miles of open drain cut for oiling, etc.
(3) 7 miles of rock channels made on steep mountain sides.
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M 119
590. By the middle of the year all possible mosquito breed- ing places within 3/8ths of a mile from the lines had been des- troyed. In spite of this it was still possible to catch in the lines. large numbers of adult anophelines showing that the radius of sanitated area was not yet sufficient.
591. As it was unlikely that the extension of an additional 1/8th mile would prevent the access to the lines of all anophe- lines and as it was impossible to predict with certainty how much further it would be necessary to go the Medical Autho- rities recommended mosquito nets or proofing the lines.
592. Single nets were tried but proved a failure. It was then decided to screen the windows and doors with fourteen mesh copper gauge. This mesh had in the laboratory proved impervious to all anophelines.
593. As so often happens in cases where attempts are made to screen houses which have not been designed with a view to that end the result was only a partial success; in fact some lines became excellent mosquito traps. Whereas previous to screening Anopheles hyrcanus was rarely captured in consider- able numbers. They found their way in but could not find their way out.
594. By the end of the year all the area up to the half mile circle had been cleared of breeding places. Anophelines however continued to be caught in the lines showing that under the conditions prevailing the range of flight and therefore the limit of safety exceeds half a mile.
J
595. The antimosquito measures taken by the medical staff included oiling and paris-green application to the breeding places and the catching of adult mosquitoes in the lines. The catching of large numbers of mosquitoes each of which is a possible medium of spread of malaria must have a beneficial effect and it is probable that mosquito catching in the lines was of considerable value in preventing a rise in the incidence rate.
596. A detailed account of the antimosquito work done by the staff under the control of the Malariologist is contained in his annual report which will be found in the appendix.
597. The following data supplied by the Resident Engineer shows the extent of the very important anti-malaria engineering works carried out by his staff.
(1) 326 acres cleared of brushwood, etc.
(2) 61 miles open drain cut for oiling, etc.
(3) 7 miles of rock channels made on steep mountain
sides.
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