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,