Messrs. Puttick and Simpson, who have during the present week been selling the curious Dramatic Library, printed and manuscript, and the theatrical portraits of the late Mr. James Winston, will commence, on Monday, the sale of Mr. Mitchell's Collection of Autograph Letters. The most interesting portion of these are eight-and-forty unpublished letters by Garrick, among which is one written to his brother Peter, commenced on the day on which he made his appearance on the London boards and finished on the following. In it he communicates his change of occupation to his brother, premising that since he had been in business he had "run out four hundred pounds, and found trade not increasing," and had now begun to think of some way of redeeming his fortune. "_My mind (as you know) has always been inclined to the stage_; nay, so strongly so, that all my illness and lowness of spirits was owing to my want of resolution to tell you my thoughts when here.... Though I know you will be displeased with me, yet I hope when you shall find that I may have the genius of an actor without the vices, you will think less severe of me, and not be ashamed to own me for a brother." He makes an offer as to the transfer of his business, stock, &c. "_Last night I played Richard the Third to the surprise of every body_; and as I shall make very near 300_l_. per annum of it, and as it is really what I doat upon, I am resolved to pursue it." In a postscript, he adds, "I have a farce (_The Lying Valet_), coming out at Drury-lane." And his progress in his new profession is shown in another letter, addressed also to his brother Peter, on the 19th of April following, in which, after mentioning some affairs of business connected with their wine trade, he says: "The favour I have met with from the greatest men has made me far from repenting of my choice. I am very intimate with Mr. Glover, who will bring out a Tragedy next winter on my account. I have supp'd with the great Mr. Murray, Counsellor, and shall with Mr. Pope by his introduction. I supp'd with Mr. Littleton, the prince's favourite, last Thursday night, and met with the highest civility and complaisance; he told me he never knew what acting was till I appeared, and said I was only born to act what Shakspeare writ.... I believe nobody as an Actor was ever more caressed, and my character as a private man makes 'em more desirous of my company (all this _entre nous_ as one brother to another). I am not fixed for next year, but shall certainly be at the other end of the town. I am offered 500 guineas and a clear benefit, or part of the management," &c. The whole collection forms, indeed, a curious and new contribution towards the biography of that distinguished actor. * * * * * BOOKS AND ODD VOLUMES WANTED TO PURCHASE. (_In continuation of Lists in Nos. 5. and 6._)