The Popular Science Monthly 1912-06: Vol 80
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eed TH # FOPULAR SCIENCE MONTHLY. JUNE, 1912 TROPICAL SUNLIGHT? By Dr. PAUL C. FREER LATELY DIRECTOR OF THE BUREAU OF SCIENCE, MANILA HE subject of the influence of sunlight in the tropics has been the subject of extended discussion for many years, and the general opinion seems to be that the intensity of insolation is the most impor- tant factor influencing the physical welfare of the white inhabitants in those parts of the world lying within the regions which are generally considered as having a tropical climate. In considering the question of what may be regarded as a tropical climate, we are too apt to be influ- enced by preconceived opinions as to what the dominating factors are, and we are prone to lose sight of the fact that there is as much differ-* ence between tropical climates as between those in the temperate zones. Persons living in the tropics are almost certain, during their early years of residence, through ignorance or otherwise, radically to change their mode of living and subject themselves to hygienic conditions which they would consider inadmissible in their former homes. The races of ‘people native to the tropical zones have no knowledge of bacteriology and pathology which would enable them to understand the measures to be taken to avoid infectious and other diseases, whereas they live in regions where the absence of a pronounced winter is favorable to the tich development of microscopical life. As a consequence, many of the ill effects which are attributed to sunlight may in reality be due to entirely different causes. Again, races native in the tropics, as a rule, do not have access to the complete food supplies of persons in temperate 1The manuscript of this article was received by the editor two weeks after the cabled announcement of the lamented death of Dr. Freer. Dr. Freer had attained high distinction as a chemist and since taking charge of the scientific work of the government in the Philippines in 1901, had contributed greatly to the organization and advancement of the scientific work under our government. VOL, LXXX.—35,
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