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Hygromʃtrie Conditions.—The relative humidity of the atmosphere has been regarded as an important factor in relation to phthisis. It would seem, indeed, that the degree of saturation of the air with moist must have a very decided influence upon the progr of puLnonary tuberculosis. In accordance, therfore, with the plan outlined in the first paper, bearing upon the prevalence of consumption will b studied in a very general manner.
The annual rainfall has been taken as a standard in estimating the comparative humidity of different regions. This standard has been adopted, notwithstanding the well known fact that it is not always correct, the effect of a large rainfall being modified by the porosity and drainage of the soil, and perhaps other conditions. A large annual rainfall is so constantly associated with a high degree of humidity, however, and vice versa, that it will serve perfectly well as a basis of
McCASKEY G. GEOGRAPHICAL PATHOLOGY OF CONSUMPTION. JAMA. 1885;V(3):67–69. doi:10.1001/jama.1885.02391030011001c
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