JOHN W. THOMSON, successor to JAMES BOGARDUS, corner of White and Elm Sts., New York. LEHIGH UNIVERSITY.--TUITION FREE. Civil, Mechanical, and Mining Engineering; Chemistry and Metallurgy; Full Classical Instruction; French and German; English Literature; International and Constitutional Law; Psychology and Christian Evidences. For Registers, address the Rev. JOHN M. LEAVITT, D.D., President, Bethlehem, Penna. DRILLS, Jigging Machines, etc. Illustrated catalogues sent FREE Address AMES M'F'G CO., Chicopee, Mass. PHOSPHOR-BRONZE AND ITS APPLICATIONS. By ALEXANDER DICK. A series of valuable tests, showing the superiority of Phosphor-bronze over ordinary bronze. Old bronze and new compared. Phosphor-bronze under oft-repeated strains; also its adaptability to frictional purposes. Contained in SCIENTIFIC AMERICAN SUPPLEMENT No. 79. Price 10 cents. To be had at this office and of all newsdealers. [Illustration: Advertisement H. W. JOHNS' PATENT ASBESTOS MATERIALS.] PAINTS, ROOFING, STEAM PIPE AND BOILER COVERINGS, STEAM PACKING, _Sheathings, Fire, Acid_, and _Waterproof Coatings, Cements_, etc. Send for Samples, Illustrated Catalogues, Price Lists, etc. 87 MAIDEN LANE, NEW YORK. FIFTY SYRUP RECIPES, FOR HOUSEHOLD purposes, Mineral Waters, etc., to wit: Simple Syrup, (2) Lemon Syrup, Mulberry Syrup, Vanilla Syrup, Vanilla Cream Syrup, (2) Cream Syrup, Ginger Syrup, Orange Syrup, (2) Pineapple Syrup, Nectar Syrup, Sherbet Syrup, Grape Syrup, Banana Syrup, (2) Coffee Syrup, Wild Cherry Syrup, Wintergreen Syrup, (2) Sarsaparilla Syrup, Maple Syrup, (2) Chocolate Syrup, Coffee Cream Syrup, Ambrosia Syrup, Hock and Claret Syrup, Solferino Syrup, Capsicum Syrup, Cherry Syrup, Strawberry Syrup, (2) Raspberry Syrup, Peach Syrup, Blackberry Syrup, Orgeat Syrup, Catawba Syrup, Milk Punch Syrup, Champagne Syrup, Sherry Cobbler Syrup, Excelsior Syrup, Fancy Syrup, Currant Syrup, Framboise Syrup, Maidenhair Syrup, Orange Flower Syrup, Cinnamon Syrup. How to make Syrups Frothy. Colognes for the Sick Room, by GEO. LEIS. With recipes for the production of preparations that serve as pleasing perfumes, deodorizers, and cosmetic lotions. All the above are contained in SCIENTIFIC AMERICAN SUPPLEMENT No. 77. Price 10 cents. To be had at this office and of all newsdealers. * * * * * THE "Scientific American" is printed with CHAS. ENEU JOHNSON & CO.'S INK. Tenth and Lombard Sts., Philadelphia, and 59 Gold St., New York. * * * * * Transcriber's Note: _x_ indicates italic script. Some archaic (Early American) spellings have been retained. Errata: Article 13 ("CALLIN AND WILSON'S PROCESS OF UTILIZING TIN SCRAP.'"): 'thin' corrected to 'tin' "... the requisite quantity depending upon the thickness of the tin plate to be removed." Article NQ (39): 'put' corrected to 'but' "... but plenty of good soap and warm water,..." P. 16, Advert for 'ROOTS' FORCE BLAST BLOWER':