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 formulæ. 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

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