Price 10 cents. For sale by all newsdealers. I. ENGINEERING AND MECHANICS.--The Herreshoff Torpedo Boat, recently built at Bristol, R. I., for the British Government. The novelties in the placing of the screw, etc. The Peculiar Boiler. 4 figures.--Improved Hopper Steam Dredger. 2 figures.--The St. Gothard Tunnel.--The Beacon Tower of Lavezzi. 3 figures. II. ARCHITECTURE.--Bath Abbey Church. Full page illustration. III. TECHNOLOGY.--The Achison Stone Cutting Machine. 1 engraving.--The Deep Mines of the World.--Shoemakers' Wax.--Gruber's New Method of Germination. 1 engraving.--Improved Process for Treating Wood, etc., for Paper Manufacture.--Bronzing Plaster of Paris Casts.--Sal Soda for Unhairing Hides and Skins.--Sieburger's Paste.--To Tan Lace Leather with Softsoap. Practical Dyeing Recipes: Blue white zephyr, Scotch blue on worsted, Scotch green on worsted, jacquineaux on worsted, drab on worsted, gold on venetian carpet yarn, red brown slubbing, scarlet braid, slate braid, light drab on cotton, blue on cotton, brown on cotton, chrome orange on cotton carpet yarn, black on common mixed carpet yarn for filling, black on cotton and wool mixed yarn. Damar Varnish for Negatives.--To Make Vignetters by Means of Gelatino-Chromate.--Resorcine Colors.--Phosphate Soaps.--Substitution of Different Metals in Ultramarine Colors.--A Harmless Green for Paper Hangings.--Siegwart's Bath for Etching Glass.--Composition of French Bronzes.--A New Enemy to the Tea Plant.--The Bradford Oil Sand. IV. CHEMISTRY AND METALLURGY.--Apparatus for Titration, 1 figure.--Palladium.--Haemocyanin.--Test for Alcohol in Ethereal Oils and Chloroform.--Reaction of Tartaric and Citric Acid.--A Peculiar Observation.--Insolubility of Iodate of Lead.--Mode of Preventing the Contamination of Water with Lead.--Separating Phosphorus from Iron and Steel.--Production of Alcohol without Fermentation. V. ELECTRICITY, LIGHT, HEAT, ETC.--Some Facts in regard to Telescopic and Stereoscopic Vision.--The Centenary of the Birth of Sir Humphry Davy. His boyish days. His first chemical experiments. His first lecture at the Royal Institution. A very entertaining biographical sketch.--Light and Heat in Gas Flames.--Nickel Needles for Compasses.--The Nature of the Elements.--A New Compound Prism for Direct Vision Spectroscopes. VI. MEDICINE AND HYGIENE.--Filaria in the Eye. By CHAS. S. TURNBULL, M. D.--The Species of Tapeworm now Prevalent.--Nitrous Oxide under Pressure. VII. NATURAL HISTORY, GEOLOGY, ETC.--A Gigantic American Deep-sea Crustacean, 1 engraving.--Glaciers in the United States.--The Toulomne Cave.--Archaeological Explorations in Tennessee. By F. W. PUTNAM. 6 figures.--Memorably Cold Winters.--Life at Timber Line. By Professor C. E. ROBINS, Summit, Colorado.--The Walled Lake in Iowa.