I. CIVIL ENGINEERING.--The Girard Hydraulic Railway.--One of
the great curiosities of the Paris exposition, the almost
frictionless railway, with sectional illustrations of its
structure.--8 illustrations. 11451
II. ELECTRICITY.--Early Electric Lighting.--Electric lighting in
Salem in 1859, a very curious piece of early history. 11458
Electric Motor for Alternating Currents.--A motor on an
entirely new principle for the application of the alternating
current with results obtained, and the economic outlook of
the invention. 11458
Portable Electric Light.--A lamp for military and other use,
in which the prime motor, including the boiler and the lamp
itself, are carried on one carriage.--1 illustration. 11458
The Electric Age.--By CHARLES CARLETON COFFIN.--A short
_resume_ of the initial achievements of modern
electricity. 11458
III. GEOLOGY.--The Fuels of the Future.--A prognosis of the future
prospect of the world as regards a fuel supply, with a
special reference to the use of natural gas. 11457
IV. MISCELLANEOUS.--Preservation of Spiders for the Cabinet.--A
method of setting up spiders for preservation in the cabinet,
with formulæ of solutions used and full details of the
manipulation.--1 illustration. 11461
The Ship in the New French Ballet of the "Tempest."--A
curious example of modern scenic perfection, giving the
construction and use of an appliance of the modern ballet.--5
illustrations. 11450
V. NAVAL ENGINEERING.--Crank and Screw Shafts of the Mercantile
Marine.--By G. W. MANUEL.--This all-important subject of
modern naval engineering treated in detail, illustrating the
progress of the present day, the superiority of material and
method of using it, with interesting practical examples.--1
illustration. 11448
Experimental Aid in the Design of High Speed Steamships.--By
D. P.--A plea for the experimental determination of the
probable speed of ships, with examples of its application in
practice. 11449
Forging a Propeller Shaft.--How large steamer shafts are
forged, with example of the operation as exhibited to the
Shah of Persia at Brown & Co.'s works, Sheffield, England.--1
illustration. 11447
The Naval Forges and Steel Works at St. Chamond.--The forging
of a piece of ordnance from a 90 ton ingot of steel, an
artistic presentation of the subject.--1 illustration. 11447
VI. PHOTOGRAPHY.--The Pyro Developer with Metabisulphite of
Potash.--By Dr. J. M. EDER.--A new addition to the pyro
developer, with formulæ and results. 11462
VII. PHYSICS.--Quartz Fibers.--A lecture by Mr. C. V. BOYS on his
famous experiments of the production of microscopic fibers,
with enlarged illustrations of the same, and a graphic
account of the entire subject.--7 illustrations. 11452
The Modern Theory of Light.--By Prof. OLIVER LODGE.--An
abstract of a lecture by the eminent investigator and
expositor of Prof. Hertz's experiments, giving a brief review
of the present aspect of this absorbing question. 11459
VIII. PHYSIOLOGY.--Heat in Man.--Experiments recently made by Dr.
Loewy on the heat of the human system.--Described and
commented on by Prof. ZUNTZ. 11461
IX. SANITATION.--On Purification of Air by Ozone--with an Account
of a New Method.--By Dr. B. W. RICHARDSON.--A very important
subject treated in full, giving the past attempts in the
utilization of ozone and a method now available. 11460
X. TECHNOLOGY.--Alkali Manufactories.--Present aspect of the
Leblanc process and the new process for the recovery of
sulphur from its waste. 11457
Dried Wine Grapes.--The preparation of the above wine on a
large scale in California, with full details of the process
adopted. 11461
The Production of Ammonia from Coal.--By LUDWIG MOND.--A
valuable review of this important industry, with actual
working results obtained in carrying out a retort process.--2
illustrations. 11454
Nature, Composition, and Treatment of Animal and Vegetable
Fabrics.--The history of fabrics and fibers in the vegetable
and animal world, their sources, applications, and
treatments. 11453
Walnut Oil.--By Thomas T. P. BRUCE WARREN.--An excellent oil
for painters' use, with description of a simple method for
preparing it on a small scale. 11462
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