od of setting up spiders for preservation in the cabinet,
with formulae 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 formulae 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
com