| TABLE OF CONTENTS. |
|---|
| I. | CHEMISTRY AND METALLURGY.—Beeswax and its Adulterations. —Chemical ingredients.—Detection of adulterations. | 7064 |
| Phenol in the Stem, Leaves, and Cones of Pinus Sylvestris. —A discovery bearing on the flora of the Carboniferous epoch and the formation of petroleum. | 7065 |
| The School of Physics and Chemistry of Paris.—With engraving of laboratory. | 7065 |
| Some Relations of Heat to Voltaic and Thermo Electric Action of Metals in Electrolysis.—By G. GORE. | 7070 |
| II. | ENGINEERING, MECHANICS, ETC.—Air Refrigerating Machine.—5 figures. | 7071 |
| A Gas Radiator and Heater. | 7071 |
| Concrete Water Pipes. | 7071 |
| The Sellers Standard System of Screw Threads. Nuts, and Bolt Heads.—A table. | 7072 |
| An English Railway Ferry Boat.—3 figures. | 7072 |
| The Problem of Flight and the Flying Machine. | 7072 |
| III. | TECHNICAL.—Concrete Buildings for Farms.—How to construct them. | 7063 |
| What Causes Paint to Blister and Peel?—How to prevent it. | 7063 |
| Olive Oil.—Difficulties encountered in raising an olive crop.—Process of making Oil. | 7064 |
| IV. | ELECTRICITY. ETC.—Telephony and Telegraphy on the Same Wires Simultaneously.—4 figures. | 7067 |
| The Electric Marigraph.—An apparatus for measuring the height of the tide.—With engravings and diagrams showing the Siemens and Halske marigraph and the operation of the same. | 7068 |
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