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TABLE OF CONTENTS.
PAGE
I. CHEMISTRY AND METALLURGY.—Determination of Tannin.—By E. Johanson. 7458
The Incomplete Combustion of Gases.—By H. B. Dixon.—Abstract of paper read before the British Association at Montreal. 7458
Aluminum and its Alloys. 7462
II. ENGINEERING AND MECHANICS.—The New Dam at Suresnes.—With engraving. 7453
Bréarey's Aeronautical Machine.—With engraving. 7453
Raising of the Fallen Girder of the Douarnenez Viaduct.—2 engravings. 7454
Improved Wire Testing Machine.—With engraving. 7454
Improved Doubling and Laying Machine.—With engraving. 7454
Boiler Tubes. 7455
Improved Ladle Carriage.—2 figures. 7455
The Repair of Boiler Tubes.—11 figures. 7455
Grulet's Screw for Raising Water.—1 engraving. 7456
III. TECHNOLOGY.—On Various Toning Baths.—Several experiments.—By W. M. Ashman. 7456
Coating Plates with Gelatine Emulsion.—5 figures. 7457
Iodo-chloride of Silver Emulsion.—By V. Schumann. 7458
Apparatus for Saturating Water with Sulphurous Acid.—1 engraving. 7458
IV. PHYSICS, ELECTRICITY. ETC.—The Wave Theory of Light.—By Sir Wm. Thomson.—Sound and light due to wave vibrations.—Difference between vibrations of light and sound.—Radiant heat.—Solar spectrum.—Luminiferous ether.—How to measure wave lengths of light and the frequency of vibrations.—With diagrams. 7448
The Limitations of Submarine Telegraphy. 7450
Williams' System of Coast Defense by Electrical Torpedoes.—Full page of figures. 7451
New Electric Gas Lighter.—2 figures. 7452
Insulators for Telegraph and Telephone Lines.—9 figures. 7452
Electric Light in Theaters. 7452
Rings of Smoke.—5 figures. 7461
V. ARCHITECTURE.—The New Technical High School of Berlin.—With engraving. 7447
The New University Buildings at Strassburg.—2 engravings. 7447
VI. BOTANY, ETC.—An Improved Hyacinth Glass. 7461
The Botanical Club of the American Association. 7461
VII. HYGIENE, MEDICINE, ETC.—Herbst's Method of Filling.—Demonstrated by Dr. G. C. CLUDINS. 7459
Dr. Koch's Berlin Lecture on Cholera and the Comma Bacillus. 7459
Local Anæsthesia by the Hydrochlorate of Cocaine.—By R. J. Levis, M.D. 7459
On Sewage Disposal on Land, by Chemical Treatment, and by Discharge into River or Sea.—By Prof. H. Robinson. 7460
VIII. MISCELLANEOUS.—New York City Street Cars. 7460
Petroleum Wells. 7462