Chapter II: ELECTRICITY, ETC.--Electricity. What it is and what may be
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expected of it. By JACOB REESE. 4974
Electric Light Apparatus for Photographic Purposes. By A.J.
JARMAN. 2 figures. 4976
Desruelles's Electric Lighter. 1 figure. 4976
Solenoid Underground Wires in Philadelphia. 4976
Dr. Herz's Telephonic Systems. 2 figures. 4976
Decision of the Congress of Electricians on the Units of
Electric Measures. 4977
Secondary Batteries. By J. ROUSSE. 4977
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Scientific American Supplement, No. 312, December 24, 1881Chapter II: ELECTRICITY, ETC.--Electricity. What it is and what may be
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