. Transactions of the American Climatological and Clinical Kic. 2.—Albino taking first sun Fig. 4. — Heliotherapy in Colorado. Tuberculosis of the knee-joint. HELIOTHERAPY IN COLORADO 185 number of red cells. These effects can often be observed bythe use of different baths or massage, which tend also tocause a superficial congestion; but in using the solar energyon the skin there is another force which, perhaps, is morepotent and far-reaching in its effect on man than all the otherrays together, and these are the actinic, or ultra-violet rays,called also the dark or chemic
. Transactions of the American Climatological and Clinical Kic. 2.—Albino taking first sun Fig. 4. — Heliotherapy in Colorado. Tuberculosis of the knee-joint. HELIOTHERAPY IN COLORADO 185 number of red cells. These effects can often be observed bythe use of different baths or massage, which tend also tocause a superficial congestion; but in using the solar energyon the skin there is another force which, perhaps, is morepotent and far-reaching in its effect on man than all the otherrays together, and these are the actinic, or ultra-violet rays,called also the dark or chemical rays. Although these raysfrom the sun cannot be seen, they exist in the sunshine andhave a powerful effect on all cellular life. The actinic rays falling on a white skin are nearly allreflected back and do not penetrate, but when the white skinbecomes bronzed from deposit of pigment this pigment actsas a transformer to the actinic rays and they then pass freelyinto the skin. The actinic rays now allowed to penetrateinto or through the skin act on the corpuscles of the blood,present in large numbers in
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
