1 APRIL 1911, Page 24

Electricity in the Service of Man. By P. idallineux Wahnsey,

D.Sc. VoL I. (Cassell and Co. 7s. 6d. net.)—This first volume of what is to be a " Popular and Practical Treatise on the Applica- tions of Electricity to Modern Life " deals with the " History and Principles of Electrical Science" ; a second is to follow treating of the "technology," subdivided into "applications" involving the use of heavy and small currents. The subject, though popularly handled, is of too technical a character for detailed treatment in these columns ; we must be contented with this brief notice. One thing is obvious : there is no stinting of space of text over illustrations. The volume before us contains 828 pages, and is copiously illustrated throughout.