From the New-York Commercial Advertiser, Sept. 8.
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From the New-York Commercial Advertiser, Sept 8.

 Dr Mitchell We alluded briefly yesterday to the death of this distinguished scientific man, which was announced to us but short time previous to the publication of the paper. He died in his sxtyeighth year, after an illness which afforded little room to hope for his ultimate recovery; but still his depar- ture was sudden and unexpected. He was a man who, with wonderful faculty of retention, and unr- ing industry, had accumulated more knowledge as to facts books, and natural history, than most men, however celebrated, of this or any other age There were few subjects on which he could not furnish such information would lead the inquirer alright in his own researches. He enlarged the boundaries of discovery in natural science and stimulated and assisted all who were pursuing the same objects.- He was for great number of years professor of va rlous branches Tn the College of Physicians and Surgeons, and was Dean of the Faculty, His la bors are dispersed in many volumes. Many cab

 nets are enriched by his collections. And there are few philosophical societies of note in the world, of which he was not member. He was elected to

 the assembly of this State soon after the revolution

 and was afterwards member of Congress, and the colleague of De Witt Clinton. His acquaintance with history, and with civil and international law

 was extensive and accurate. There was an amia- be simplicity in his character, connected with a consciousness of his own acquisitions, which was confounded with vulgar vanity only by the vulgar mind. He did much to promote the cause of science; and science must regret his loss. The funeral takes place tomorrow afternoon, from his late residence; and his obsequies will no doubt be attended by the different learned bodies and literary and scientific societies of the city