PHYSICAL ALLERGIES

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Abstract
GENERALLY speaking, the physical allergies deal with those reactions of hypersensitiveness due to cold, heat, radiant energy, pressure, and mechanical stimuli. I am particularly concerned in this study with those reactions due to heat and cold. However, before going on to my subject I should like to mention that reactions of hypersensitiveness occur occasionally with roentgen, grenz, and radium irradiation, in addition to the rays of the visible spectrum, and it is important to note that certain instances of so-called photosensitivity really are due to the heat of such energy rather than the light per se. If we are to accept the reactions of hypersensitiveness to heat and cold as truly allergic we must use the term broadly and in the sense originally defined by von Pirquet, that is, as an "altered capacity to react." Almost no one, however, agrees with this broad concept, but the feeling persists that the

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