Orthochromatic Plates.--By CH. SCOLIK.

A New Photographic Apparatus.--With engraving.


IV. ELECTRICITY, PHYSICS, ETC.--On the Theory of the
Electro-magnetic Telephone Transmitter.--By E. MERCADIER.

On the Theory of the Receiver of the Electro-magnetic
Telephone.--By E. MERCADIER.

Frew's Improved Pyrometer.--With engraving.

Dew.--Abstract of a paper read before the Royal Society of
Edinburgh.--By Mr. AITKEN.--Source of dew.--Observations of the
temperature of the ground.--Experiments.--Effects of
wind.--Excretion of drops of liquid by plants.--Radiating power of
different surfaces at night.


V. ASTRONOMY.--Meteorites.--The Dhurmsala Meteorite.

Telescopic Search for the Trans-Neptunian Planet.--By DAVID P.
TODD.


VI. ARCHITECTURE.--The New "Burgtheater" in Vienna.--With
full page engraving.

The New German Bookdealers' Exchange in Leipzig.--With engraving.