Some observers have taken the position that bronchitis is due to a special germ; its port of entry being the air passages, and that the resulting disturbance is but an incident. The majority of us, I believe, will admit, however, that bronchitis as a rule is occasioned by simply "taking cold." The conditions favorable are constipated habit, improper diet, disturbed digestion, perverted secretions and exposure to cold, resulting in the chilling of the surfaces. As a consequence of this combination, we may have bronchitis or, in fact, a catarrhal condition of any one or all of the mucous membranes of the body. Were it not a bronchitis it might be a laryngitis, a rhinitis, a gastritis, an enteritis, a nephritis, a cystitis, or in fact we might have all of them combined in the same case. If in any marked degree, we would not have our case long.