Chapter II: ELECTRICITY, ETC.--Siemens' Improvements in Electric

Railways. 4 figures. Siemens' combined steam and electric
railway.--Siemens' electric mail railway 3743
Difference in the Actions of Positive and Negative
Electricity 3743
Forces Exciting Electricity 3743
The New Electrical Middlings Purifier. By THOS. B. OSBORNE.
5 figures 3744
Physical Society, London. Photo--electricity.--Electrometer
key.--Air in water.--Steam thermometer 3745
Atmospheric polarization. Influence of terrestrial magnetism 3745