1352

Gibraltar and Neighborhood.--A consular report on the
statistics of the famous military station. 11352

The Defense of Gibraltar--Experimental Naval and Military
Operations.--Interesting series of operations recently
carried out under the shadow of the historic rock.--1
illustration. 11352

IX. NAVAL ENGINEERING.--Clark's Gyroscopic Torpedoes.--A
recent torpedo, in which all the possible parts are made
to rotate.--2 illustrations. 11353

The First Steamboat on the Seine.--The Marquis de
Jouffroy's steamer of 1816.--1 illustration. 11353

The Franz Josef I., New War Ship.--Details of the
dimensions of the new Austrian ship.--Her armament,
speed, armor, etc. 11353

X. PHOTOGRAPHY.--Orthochromatic Photography.--By OSCAR O.
LITZKOW.--The last developments in this interesting
branch of photographic art, with formulae. 11360

Platinotype Printing.--A description of the most advanced
method of conducting the platinum print process. 11360

XI. PHYSICS.--Iridescent Crystals.--By LORD RAYLEIGH.--An
abstract of a lecture by the distinguished physicist,
detailing some interesting experiments applicable to the
colored reflection observed in crystals of chloride of
potash.--1 illustration. 11366

Transmission of Pressure in Fluids.--By ALBERT B.
PORTER.--An apparatus for illustrating the laws of
transmission of pressure in fluids, suitable for lecture
purposes.--1 illustration. 11362

XII. TECHNOLOGY.--Notes on Dyewood Extracts and Similar
Preparations.--By LOUIS SIEBOLD.--The recent development
in the preparation of dyewood extracts, with notes of
their adulterations. 11359

* * * * *

THE DEFENSE OF GIBRALTAR: EXPERIMENTAL NAVAL AND MILITARY
OPERATIONS.

[Illustration: THE DEFENSE OF GIBRALTAR--EXPERIMENTAL NAVAL AND
MILITARY OPERATIONS.]

A novel and interesting series of operations was carried out at
Gibraltar a few weeks ago, with a view to test the promptitude with
which the garrison of the famous Rock could turn out