9952

Electric Launch--A French government launch with Krebs
electric motor. 9954

The electric current as a means of increasing the tractive
adhesion of railway motors and other rolling contacts.--By
ELIAS E. RIES--A full review of this important subject, with
accounts of its experimental examination. 9953

V. ENGINEERING--Benier's Hot Air Engine--A new caloric engine
very fully illustrated and described--8 illustrations. 9943

Heating Marine Boilers with Liquid Fuel--A simple apparatus
and recent experiments with the same.--3 illustrations. 9945

The Change of Gauge of Southern Railroads in 1886--By C.H.
HUDSON.--The conclusion of the account of this great
engineering feat, with tables of statistics and data--16
illustrations. 9946

Your Future Problems--By CHAS. E. EMERY--An address to
the graduating class of the Stevens Institute, N.J.--A
practical view of the engineering profession. 9943

VI. MISCELLANEOUS--A Group of Hampshire Downs--A typical
breed of sheep, their qualities and habits.--1 illustration. 9957

VII. NAVAL ENGINEERING--The Spanish Cruiser Reina Regente--A
further description of this celebrated vessel--4
illustrations. 9948

Torpedo Boats for Spain--The Azor and Halcon, two Yarrow
torpedo boats, described and illustrated--7 illustrations. 9947

VIII. PHOTOGRAPHY--How Different Tones in Gelatino-chloride Prints
may be Varied by Developers.--Twenty different formulae for
the above purpose. 9949

Film Negatives--Eastman stripping films, their manipulation
and development. 9949

IX. SANITATION--French Disinfecting Apparatus--A portable
apparatus for disinfecting clothes and similar objects--1
illustration. 9952

X. TECHNOLOGY.--The Manufacture of Cocaine--The extraction
of cocaine with alkali and petroleum, with statement of
percentage yielded by various leaves. 9954

The Production of Oxygen by Brin's Process--The commercial
ma