Scientific Books to order. Macdonald & Co.,37 Park Row.N.Y . Coffee Pots.—The Patent No. 90,159, for sale for the United States. See page 364, Scientific American,f or description. Address W. O. C Erskine, care Z. A. Lash, Esq., Toronto, Canada.. Great Novelty from England.—Patent Crispin Machinery for manufacture of boots and shoes. These Patents for sale. Address Caleb Huse, 17 Broad St., New York. For the best grate bar address Hutchinson, Laurence & Co., 88 Cortlandt St., New York. $2000 will buy the whole of a valuable patent. Address 8.W. Wllcox, South Milford, Mass. Joseph Champion's First Premium Portable Engine.—Send for Circular to Joseph Champion, 40 Cortlandt St., New York. Patentees and makers of ice machines that are and have been workingpractically and profitably, address Box 518, Augusta, Ga., giving full particulars. State Rights for sale of best Automatic Gas Machine invented. Process : combination of hydrogen and carbon. Cost one third of coal gas. One foot equals five of coal gas in light. Machines cheap. C.F.Dunder-dale, 90 Wall St., New York. Wheelbarrows—Pugsley & Chapman, 30 Platt st., New York, will send any style, C.O.D., and if not liked, when seen, may be returned on paying freight one way. Rockwood's process for copying drawings, original size, by superposition, is thoroughly practical and successful. Address 830 Broad -way, New York. For illustrated catalogue of Croqueteries, address Milton Bradley & Co., Springfield, Mass. Scientific American—Old and scarce volumes, numbers, and entire sets of the Scientific American for sale. Address Theo. Tuseh, Box 448, or Boom 39, No. 37, Park Row, New York city. Banty & Andrews, manufacturers of Corn and Cobb Grinders',, will please send their address to E. Dunn, 82 Market St., Newark, N. J. An English machine-making firm is open to make arrangements to manufacture and introduce in England any good American invention. Satisfactory references given. Address Box 1233 Posto-fiice, N. Y. For sale—The entire Right, or State and County Rights for the best Holdback for carriages out. Complete in two pieces. No tongue or spring employed. Beckwith & Graham, Oriskany, N. Y. Wanted—Address of manufacturers of machinery for grinding old fire bricks and other hard substances. Hofton & Mabie, PeeksMll,N.Y. Wanted—Machinist, repairing cotton mill, Box 2638, N. Y. Manufacturers of Arkansas Stone address A. R Stewart, Rowles-burg, W. "Va. Wind-mill builders will please address A. P. Iluntington, Lake Charles, La. Peck's patent drop press. Milo Peck & Co., ISew Haven, Ct. State Rights for sale of a new and valuable improvement on the velocipede, in successful operation. IJ. H. Soule, Binghamton, N. Y Glynn's Anti-incrustator for steam boilers—the only reliable preventive. Prevents foaming and does not attack the metals of the boiler. Liberal terms to agents. M. A. Glynn & Co.,735 Broadway, New York. For the best hammer and sledge handles, made of carefully selected, well-seasoned, second-growth hickory address Hoopes, Bro. & Darlington, West Chester Spoke Works, West Chester, Pa. Tempered steel spiral springs made to order. John Chatillon, 91 and 93 Cliff St., New York. A Revolution in buying and selling, manufacturing and introducing Patents and Patent articles of all kinds. Inclose stamps. National Patent Exchange, Buffalo,N. Y. Every Mechanicshould have Baxter's Adjustable "S" Wrench No. 8, Vol. 30, this journal. Baxter Wrench Co., 10 Park Place, New York A. A. Fesquet, practical and analytical chemist. Construction of chemical works, etc., 323 Walnut St., Philadelphia. Builders, and all who contemplate making improvements in buildings, can save time and money by addressing A. J. Bicknell & Co Publishers, Troy, N. Y., or Springfield, 111. Johnson's Adjustable Hangers for shafting. Diploma awarded by the American Institute. Shop rights twenty-five dollars. Pattern castings 6 cents per lb. Address Wm. Cowin, Lambertville,N. J. The Tanite Emery Wheel—see advertisement on inside page . Diamond carbon, formed into wedge or other shapes for point- ing and edging tools or cutters for drilling and working stone, etc. Send stamp for circular. John Dickinson, 64 Nassau St., New York. The Magic Comb will color gray hair a permanent black or brown. Sent by mail for $1'25. Address Wm. Patton, Treasurer Magic Comb Co., Springfield,Mass. W. J. T.—We think the patent asbestos roofing manufactured by H. W. Johns, of this city, is the best substitute for tin or slate. It is cheap and easily applied. For solid wrought-iron beams, etc., see advertisement. Address Union Iron Mills, Pittsburgh, Pa., for lithograph, etc. Machinists, boiler makers, tinners, and workers of slieet metals read advertisement of Parker's Power PresseB. Mill-stone dressing diamond machine, simple, effective, durable. Also, Glazier's diamonds. John Dickinson, 64 Nassau St., New York. Winans' boiler powder, 11 Wall St., N. Y., removes Incrustations without injury or foaming 12 years in use. Beware of imitations.