SHIRT COLLALTS.—Polly Hunt and George W. Hunt, of New York city, administrator of the estate of Walter Hunt, deceased, has petitioned for an extension of the above patent. Day of hearing,December 13, 1869. HORSE HAY RAKE.—Mary G. Pratt, administratrix de bonis non, of the estate of Randal Pratt, late of the township of Marple, Pa., has petitioned for the extension of the above patent. Day of hearing, December 20,1869. GAS COOKING STOVE—Hiram B. Musgrove, Cincinnati, Ohio, has petitioned for an extension of the above patent. Day of hearing, December 20 1869. PLOW.—Benjamin F. Avery, of Louisville, Ky., has petitioned for the ex tension of the above patent. Day of hearing, December 20, 1869. © 1869 SCIENTIFIC AMERICAN, INC.