| TABLE OF CONTENTS. |
|---|
| I. | CHEMISTRY.--On the Different Modifications ofSilver Bromide and Silver Chloride. |
| Analysis of New Zealand Coal. |
| On the Determination of Manganese in Steel, CastIron, Ferro-manganese, etc. |
| Manganese and its Uses. |
| Ozokerite or Earth-wax. By WILLIAM L. LAY. Avaluable and instructive paper read before the New York Academy ofSciences.--Showing the nature, sources, and applications of thisremarkable product. |
| On the Constitution of the Natural Fats. |
| II. | ENGINEERING AND MECHANICS.--Improved Spring wheelTraction Engine.--With two engravings. |
| An Improved Iron Frame Gang Saw Mill.--With onelarge engraving. |
| The Heat Regenerative System of Firing GasRetorts.--Siemens' principle.--As operated at the GlasgowCorporation Works.--With two engravings. |
| A New Gas Heated Baker's Oven. |
| III. | TECHNOLOGY.--How to Produce PermanentPhotographic Pictures on Terra Cotta, Glass, etc.--With recipes andfull directions. |
| How to Make Paper Photo Negatives.--Fulldirections. |
| Some of the Uses of Common Alum. |
| An Improved Cloth Stretching Machine.--With anengraving. |
| Purification of Woolen Fabrics by HydrochloricAcid Gas. |
| Apparatus for Preventing the Loss of CarbonicAcid in Racking Beer.--With an engraving. |
| IV. | ELECTRICITY.--Application of Electricity to theBleaching of Vetable Textile Materials.--With figure ofapparatus. |
| Table Showing the Relative Dimensions, Lengths,Electrical Resistances, and Weights of Pure Copper Wires. |
| V. | ASTRONOMY.--The Solar Eclipse of 1883.--Aninteresting abstract from a report of C. S. HASTINGS (Johns HopkinsUniversity), of the American Astronomical Exhibition to theCaroline Islands. |
| VI. | ...
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