tag="{http://www.w3.org/1999/xhtml}a">Systematic Relations of Platypsyllus as determined by the Larva.—By Dr. C. V. Riley.—An important contribution to entomological science, a paper read at the meeting of the National Academy of Science, April 20, 1888.—4 illustrations.
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| VIII. HYGIENE.—Reducing Obesity—Note of general principles to be applied to diet and life. {Transcriber: Omitted by publisher.} |
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| The Care of the Eyes.—By Prof. David Webster.—A practical and scientific examination of how to preserve the eyesight and of the use and abuse of this important organ of sense. |
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| Sanitation in Massachusetts. |
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| IX. MECHANICAL ENGINEERING.—Hydraulic Tube Press.—An extraordinarily powerful press for striking up tubes from flat plates. |
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| The Distribution of Hydraulic Power in London.—A recent system introduced in London, with description of the plant and distribution pipes. |
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| The One Hundred and Twenty Ton Shears of the Port of Marseilles.—An immense set of hoisting apparatus described and illustrated.—3 illustrations. |
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| X. PHOTOGRAPHY.—Colored Photography.—Mr. J. E. Mayall's recent advances in this phase of photography. |
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| XI. PHYSICS.—Scientific Apparatus at the Manchester Royal Jubilee Exhibition.—Notes of the most interesting electrical, photometrical, and communicating apparatus. |
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| The Spectra of Oxygen.—Interesting investigations of absorption spectra of oxygen. |
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| XII. SURGERY.—Papillomatous Tumor of the Bladder, demonstrated by Means of Lister's Electro-cystoscope.—By F. N. Otis, M.D.—An interesting instance of the use of an exploratory electric light.—2 illustrations. |
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| Tumors of the Bladder Diagnosed by Means of the Electro-Endoscopic Cystoscope.—By Dr. Max Nitze.—The same general subject in further detail, giving the German practice.—5 illustrations. |
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| XIII. TECHNOLOGY.—Future Prospects for Gas Companies.—By Mr. Thos. Wood.—Fuel and oil gas and the future Utopia of improved gas manufacturing.—The ideal gas company of after days.—A valuable and suggestive paper. |
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| Advertisements. |
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THE ONE HUNDRED AND TWENTY TON SHEARS OF THE PORT OF MARSEILLES.
For a quarter of a century maritime nations have been continuously engaged in improving the mechanical appliances of their large ports. The use of tracks to bring goods to be placed on vessels as near as possible to the shipping point, the substitution of oblique moles for perpendicular ones in large docks, the creation of a hydraulic method of loading and unloading through movable cranes (which will perhaps in a near future cede to an electrical one), constitute the means most used for expediting transshipments and reducing the expense of them to a minimum. But, at the same time that the facilities for all kinds for handling packages have been increased,
