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 to resist a
sudden attack by a powerful iron-clad fleet. The supposed enemy was
represented by the Channel Squadron, under the command of Vice-Admiral
Baird, and consisting of H.
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