“It is to be remembered that a majority of the bathers experience the ‘reaction fever’ (fièvre de réaction) in the course of the treatment. The period of its occurrence is uncertain, and often it is so slight as to pass almost unobserved by the patient. This, however, is the critical moment precursory of the cure. This state of irritation seldom lasts more than a few days, and generally disappears without any internal medicine. This reaction is precisely that which ought to inspire the greatest hopes in the patient, as it announces a change in his constitution, and a victory over his malady. The disagreeable sensations, however, which he feels, often puts him out of humour with the baths, especially if old pains and discomforts, that had ceased, now re-appear, which they often do. He becomes impatient and morose, when he is re-visited by rheumatic pains, neuralgia, gout, hæmorrhoids, &c. which he had thought to be extinct. Such re-action, however, is indispensable towards the victory of nature and the baths over the disease for which they were employed. The waters of Wildbad, indeed, are remarkable for this reproduction of old disorders, at the moment they are eradicating the more recent ones.” These most important properties of the waters of Wildbad are passed entirely unnoticed by Dr. Granville, and from my own knowledge, several English have left Wildbad, at the very time they were on the point of experiencing the greatest benefits. This reaction or bath-fever, is common, as I have shewn, to most of the medicinal waters, as was seen under the head of Wisbaden, Kissengen, &c. At the former place I saw several well-marked instances of it, and satisfied myself of its reality. I have not found any description of it in the accounts of the German Spas published in England. It is a subject of the greatest importance to the invalid. The following case is related by Dr. KAISER, formerly director of these baths. I have greatly abridged it.