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580 differ materially from that for the temperate zones. As a result of these observations Major Chamberlain concludes that there is room for doubt whether light or actinic rays are factors in tropical morbidity or mortality. He found that dark subjects possessed no advantage over fair. The injurious effects sometimes attributed to light, he says, can be produced by heat and humidity in the absence of light, and to these factors he attributes such influence as the Philippine climate exerts ondoi:10.1016/s0140-6736(01)76479-3 fatcat:hnik6ef26rhjphdc3bsh7sxszy