--1 figure.
Ruler and Triangle for Hatching.
The Distillation of Sea Water.--1 figure.
Aids to Correct Exposure on Photographic Plates.--An
interesting paper by W. GOODMAN.
Isochromatic Photography.--By FRED. E. IVES.--2 figures.
Distortion from Expansion of the Paper in Photography.
III. ELECTRICITY, ETC.--On the Fritts Selenium Cells and
Batteries.--A paper read before the American Association
by C.E. FRITTS.
Electricity Applied to the Manufacture of Varnish.--2 figures.
Naglo Brothers' Telephone System.--3 figures.
The Gerard Electric Lamp.--1 figure.
A New Reflecting Galvanometer.--3 figures.
IV. ART AND ARCHITECTURE.--Groups of Statuary for the Pediment
of the House of Parliament in Vienna.--2 engravings.
The Casino at Monte Carlo.--An engraving.
V. PHYSICS.--Determining the Density of the Earth.--1 figure.
Physics without Apparatus.--The Porosity and Permeability of
Bodies.--A Hot Air Balloon.--2 engravings.
VI. NATURAL HISTORY.--Winter and the Insects.--An engraving.
Silk Worm Eggs.--With engraving.
VII.
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