viii 



SCIENCE.-ADVERTISEMENTS. 



A TIMELY BOOK OF UNQUESTIONED AUTHORITT 



BRIG. GEN. HENRY L ABBOT'S 



Problems of the Panama Canal 



Including the Physics and Hydraulics of the River Chagres, the Clima- 

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 HENRY L. ABBOT (U. S. Army, Retired), Late Colonel, Corps of 

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NOW READY. Cloth, mm, .$1.50 net {postage 12c.) 



A clear, exact and readable account of the Canal since the failure of the French Com- 

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THE MACMILLAN COMPANY, Publishers, 64-66 Fifth Ave., New York 



Two Books Indispensable to Electricians 



By HENRY M. HOBART 



Electric Motors 



Continuous Current Motors 

 and Induction Motors, Their 

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458 pp., 8vo, illustrated, $5. 



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' ' Probably the most complete and advanced 

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By TURNER & HOBART 



The Insulation of 

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By HARRY WINTHROP TURNER, 



Associate A. 1. E. E. and 



HENRY METCALF HOBART, 



M. I. E. E., Mem. A. I. E. E. 



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The results of twenty years of practical work 

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THE MACMILLAN COMPANY, Publishers, 64-66 Fifth Ave., N. Y. 



