In regard to mosquito work, it is sometimes considered that annoyance resulting {rom the bites of culicines (Lo non-malaria carriers) can taken as indicative of a breakdown in. anti-mosquito measures. It. is, however, a fact that health auithorities, not only in Shanghai, Rave discovered some years ago'that non~ selective measures against non-dis~ ease carriers not only are productive of expenditure far too heavy, even for non-depression periods, but also frequently results in the escape from treatment of breeding places frequited by disease carriers. Hence, it customary to ascertain the danger spots by surveys, and endeavour by various methods' to eliminate them. In Shanghai there are, however, two special problems not usually experi fenced within urban areas. Rice fields fare not fo be found inmost urban districts, and present a problem which can only be solved, and then only partially, by the use of thousands of fish which, by the way have to be re-collected or abandoned when the rice field Is drained, a proceed ing not invariably notifed to the Department.
'The other special problem relates to the cellular rafts necessary when erecting high buildings in the Town. It would seem' that this. Is almost a problem special to Shanghai, since no help(ul suggestions were received as a result of queries directed to authorities in countries where high buildings (but possibly not built on rats) were the rule.
Text read from the printed page and cleaned; old type leaves the occasional error.