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 closer investigation fails to identify the disease with any we have been accustomed to see, and that a strict comparison of symptoms in their individuality and sequence will be sufficient to establish a differential diagnosis with any one of them. This comparison I shall now proceed to make.

The great distinctive mark between diphtheria and croup, properly so called, is to be found in the locality chiefly affected. In both, it is true, the main feature is the presence of an exudation; but in the one disease it commences in the fauces, and only reaches the windpipe by extension and in a certain per centage of cases; while in the other, that of true inflammatory croup, it commences in the larynx and trachea, and does not necessarily affect the soft parts above the glottis at all. As a result of this, a marked difference is also found in the symptoms of the two diseases. In diphtheria the uneasiness is flrst referred to the parts subservient to deglutition; in croup, on the contrary, the symptom which earliest and most strongly excites attention is that of stridulous breathing and voice—a symptom which in diphtheria indicates the final development of diseased action. But to place this distinction in a more prominent light, we will collate a description of true croup, as given by Dr. Copland in his splendid work now just completed.

He says, speaking of the onset of the disease; "These precursory signs are well marked, and of a distinctly catarrhal nature; occasionally they are slight, chiefly of a febrile description, and either from this circumstance, or from the shortness of their duration, attract but little attention. I he febrile symptoms, when present, consist