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TABLE OF CONTENTS.

PAGE

I. CHEMISTRY AND METALLURGY.—Preparation of Chlorhydrines 6452

Chemical Compounds Made by Compression. By M. W. Spring. 6452

Copper Alloys among the Ancients. By Prof. E. Reyer.—A valuable and important paper, full of useful information, showing the geology of the metals.—Characteristics of copper alloys, with tables showing constituents used in different countries.—Casting the alloys.—Hard bronze of the ancients.—Summary of alloys used by the ancients 6452

II. ENGINEERING AND MECHANICS.—Bietrix's Vertical and Compound Engine.—With description and numerous figures 6439

Improved Gas Engine.—With engraving 6440

Meters for Power and Electricity. By M. C. Vernon Boys.—A valuable and instructive paper.—Showing the object of meters, the way in which some of them are made, and their manner of operating.—Several figures 6440

Raising and Moving Masonry Buildings.—With full page of engravings, illustrating various examples of large buildings composed of masonry that have been moved and raised 6443

III. TECHNOLOGY.—Filter for Industrial Works.—Showing how to make and use the filter.—With engraving. 6443

The Val St. Lambert Glass Works.—With full description and two illustrations. 6444

Proper shoeing.—Horses' feet should be treated in accordance with the work expected of them. 6444

Ideas.—Relating to Milling. By A Looker-on. 6445

Photographs for Studying the Movements of Men and Animals. By M. Marey.—How to avoid confusion in photographing rapid movements.—With diagram. 6445

Detective Photography.—As applied to criminal cases. 6445

Strength of Yellow Pine. 6449

IV. ARCHITECTURE.—English Lodges.—With engraving. 6447

The Decay of the Building Stones. By Dr. A. A. Julien.—The building stones, their varieties, localities, and edifices constructed of each.—Durability of building stones in New York and vicinity.—Methods of trial of building stone.—Means of protection and preservation of stone. 6447

V. ELECTRICITY.—The History of the Electric Telegraph.—First use of the Volta pile in telegraphy.—Description of Soemmering's apparatus.—With two engravings. 6446

A New Sulphate of Copper Pile.—With engraving. 6446

VI. MEDICINE AND HYGIENE.—Filth Diseases in Rural Districts.—Showing why there is greater danger of poisoning from sewage in the country than in the city.—Several examples showing apparent causes and consequences.—How is the infection carried? 6450

The Physiology of Sleep.—Giving different theories. 6451

A New Method for the Detection of Sugar in the Urine. 6452

VII. MISCELLANEOUS.—Elephants Moving Timber at Moulmein, Burmah.—With engraving. 6449

The Education of German Women. 6449

Horse Medicine Bit.—With two engravings. 6451

The Big Trees of California. 6454

Science in Antiquity.—Heron's Pneumatic and compressing apparatus.—With two engravings. 6450