Abstract
<h3>Predisposition to Colds</h3> P. Schmidt, hygienist of Halle, undertook recently a series of experiments on the origin of ordinary colds in man. His main object was to discover what persons have a special predisposition for colds. He found that colds occur most commonly in persons whose heat regulatory system easily breaks down. When such a person is chilled for some time, there is brought about, through the action of the cold, exactly as in a normal person up to this point, a contraction of the blood vessels of the skin and also of the mucous membranes of the respiratory organs. This vascular contraction of the mucosae soon retrogresses, however, in a healthy person, whereas in the person who is predisposed to colds it continues much longer. Owing to this contraction of the mucous membranes, the defense forces can no longer be adequately mobilized, and as a result of the disturbance
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