| TABLE OF CONTENTS. |
|---|
| I. | CHEMISTRY AND METALLURGY.--Carbon inSteel. |
| Heat developed in Forging. |
| Recent Studies on the Constitution ofAlkaloids.--Extract from a lecture delivered before thePhiladelphia College of Pharmacy. --By SAML.P. SADTLER. |
| II. | ENGINEERING AND MECHANICS.--Apparatus forExtracting Starch from Potatoes.--With engraving. |
| A Simple Apparatus for describing Ellipses.--ByProf. E.J. HALLOCK. 1 figure. |
| A Novel Propeller Engine.--With full descriptionand numerous engravings.--By Prof. MACCORD. |
| The New Russian Torpedo Boat, the Poti.--Withengraving. |
| A New Steamer Propelled by HydraulicReaction--Figures showing plan and side views of thesteamer. |
| A New Form of Flexible Band Dynamometer.--By Prof.W.C. UNWIN. 4 figures. |
| III. | TECHNOLOGY.--Enlarging on Argentic Paper andOpals.--By A. GOODALL. |
| The Manufacture and Characteristics ofPhotographic Lenses. |
| Improved Developers for Gelatine Plates.--By DR.EDER. |
| The Preparation of Lard for Use in Pharmacy.--ByProf. REDWOOD. |
| Anti-Corrosion Paint. |
| Manufacture of Charcoal in Kilns.--Differentkilns used. |
| IV. | ART, ARCHITECTURE, AND ARCHÆOLOGY.--TheGerman National Monument.--With two engravings of the statues ofPeace and War. |
| The Art Aspects of Modern Dress. |
| Artisans' Dwellings, Hornsey, London.--Withengraving. |
| Discovery of Ancient Church InJerusalem. |
| V. | ELECTRICITY, HEAT. ETC.--See's Gas Stove.--Withengraving. |
| Rectification of Alcohol by Electricity. 3engravings showing Apparatus for Hydrogenizing Impure Spirits.Electrolyzing Apparatus, and Arrangement of the SiemensMachine. |
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