| TABLE OF CONTENTS. |
|---|
| I. | CHEMISTRY ETC.—Decomposition and Fermentation of Milk. |
| II. | ENGINEERING AND MECHANICS.—The Ethics of Engineering Practice.—An address by Mr. JAS. C. BAYLES, before the American Institute of Mining Engineers. |
| Lifting a 40-inch Water Main.—With engraving. |
| The Inter-oceanic Canal Question. |
| The Mersey Tunnel. |
| Improved Revolver.—With 4 figures. |
| Motors for Street Railways.—Results of experiments on mechanical motors for tramways made by the jury on railway appliances at the Antwerp Exhibition.—By Capt. DOUGLAS GALTON. |
| III. | TECHNOLOGY.—Alizarine Dyes.—Process of dyeing.—Recipes for various colors. |
| Cement Paving.—Composition made by the Wilkes' Metallic Flooring Company.—Other compositions. |
| A New Bleaching Process.—The "Mather-Thompson" system. |
| Instruments for Drawing Curves.—By Prof. C.W. MACCORD—1. The Hyperbola—2 figures. |
| Experiments with Fibers.—By Dr. THOS. TAYLOR.—Detection of Fraud.—Method employed.—Cotton mixed with linen.—Experiments with flax.—Wool tested with acid.—Tests of dyed black silk. |
| Orthochromatic Plates.—By CH. SCOLIK. |
| A New Photographic Apparatus.—With engraving. |
| IV. | ELECTRICITY, PHYSICS, ETC.—On the Theory of the Electro-magnetic Telephone Transmitter.—By E. MERCADIER. |
| On the Theory of the Receiver of the Electro-magnetic Telephone.—By E. MERCADIER. |
| Frew's Improved Pyrometer.—With engraving. |
| Dew.—Abstract of a paper read before the Royal Society of Edinburgh.—By Mr. AITKEN.—Source of dew.—Observations of the temperature of the ground.—Experiments.—Effects of wind.—Excretion of drops of liquid by plants.—Radiating power of different surfaces at night. |
| V. | ASTRONOMY.—Meteorites.—The Dhur ...
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