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[On cynanche trachealis]
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exposure of any of the exciting causes of the disease, while others seem to be entirely exempt from it. Age also seems to be a predispose = ing cause, because its occurrence is much more frequent between the age of one and five than it is at any other period of life; it is of frequent occurrence at any age between one and ten years, but very rare after this time. This aptitude to the disease during childhood, has been ascribed to the pe = culiar condition of the glottis and larynx at this age, but what this peculiarity consists in is unknown. Of the exciting causes of this disease, the most common are cold and sudden vicissitude alternation of atmospheric temperature. and hence its more frequent occurrence duri = ing the variable damp and cold months of winter and spring, than in the more
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