+MUNN & CO., Publishers,+ 261 Broadway, New York, N. Y. * * * * * 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 Building the 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