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ve alluded to. I find, however, that Gehlen, a celebrated French chemist, fell a victim to it in the year 1815. His death is thus announced in the "Philosophical Magazine" for that year. "We lament to have to announce the death of Gehlen, many years the editor of an excellent Journal on Chemistry and other sciences, and a profound chemist. He fell a victim to his ardent desire to promote the advancement of chemical knowledge. He was preparing, in company with Mr. Rehland, his colleague, some arsenated hydrogen gas, and while watching for the full development of this air from its acid solution, trying every moment to judge from its particular smell when that operation would be completed, he inhaled the fatal poison which has robbed science of his valuable services." Vide Tillock's Phil. Mag., vol. 46, p. 316. Some further notice is taken of his death in a paper extracted from the "Annales de Chimie et de Physique," and published in a subsequent volume of the same Magazine. Vide vol. 49, p. 280, in which are given his last experiments on that subject, by M. Gay Lussac. I regret that no account is given in the same work of the symptoms arising from the poison in his case. I presume, however, they are on record. In the subject of the case I mention, the general and prominent symptoms were an immediate and great diminution of muscular strength, with pallor of countenance and constant febricula, the arteries of the head beating with violence, particularly when lying down at night, the pulse always moderately increased in frequency, and full, but not tense; and digestion for the most part good. This state continued for about three months, during which time he was attending to his usual business, although not able to take as much exercise as before. At the end of this time he began to recover slowly, but it was six months before he was restored entirely. Yours, etc., JOHN M. B. HARDEN. LETTER III.--FROM DR. JOSHUA PORTER. NORTH BROOKFIELD, Oct. 26, 1827. Though I would by no means favor the propensity for book-making, so prevalent in our day, yet I have been long of the opinion that a work on vegetable diet for general readers was greatly needed. I need it in my family; and there are many others in this vicinity who would be materially benefited by such a work. I have had no means of ascertaining the good or bad effects of a "diet exclusively vegetable in cases of phthisis, scrofula, and dyspepsia,
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