Dr. _Mead_’s daily acquisition of knowledge and experience, enabled him to enlarge to many beneficial purposes, this performance, which, in all probability, was at first designed only to illustrate and vindicate the sentiments contained in the aforementioned letter; and it is but justice to say, the applause it has found among the learned, as well for the elegance of its diction, as the perspicuity of its precepts, is no more than what is truely due to it.----To this discourse is subjoin’d a latin translation, from the arabic of _Rhazes_’s treatise on the _small pox_ and _measles_, a copy of the original having been obtained for this purpose by Dr. _Mead_, from the celebrated _Boerhaave_, between whom there had long subsisted an intimate correspondence, nor did their reciprocally differing in some opinions, diminish the friendship they mutually manifested for each other. The year 1749, furnished two new productions from our author; a translation of one of which follows these memoirs. The other is entitled, _a discourse on the scurvy_, affixed to Mr. _Sutton_’s second edition of his _method for extracting the foul air out of ships_. It is more than possible that, but, for the patronage of Dr. _Mead_, this contrivance, which confers no less honour to the inventor, than utility to the public, might have been for ever stifled: our author, than whom no one more ardently wished for, or more zealously promoted the glory and interest of his country, being thoroughly convinced of its efficacy, so earnestly, and so effectually recommended it to the lords of the admiralty, as to prevail over the obstinate opposition that was made against its being put into practice. To the same purpose in 1742, he explained the nature and conveniencies of this invention to the royal society,[23] and with the same view he confessedly wrote the last mentioned discourse, of which he made a present to Mr. _Sutton_. [23] In a paper read before the royal society, _Feb._ 11, 1741-2, and published in Mr. _Sutton_’s account, page 41. He also presented a model of this invention made in copper to the royal society, which cost him 200l.