The Hmerican Science Series. 
The two principal objects of this series are to supply the 
lack—in some subjects very great—of authoritative books 
whose principles are, so far as practicable, illustrated by 
familiar American facts, and also to supply the other lack 
that the advance of science perennially creates, of text- 
books which at least do not contradict the latest generali- 
zations. The scheme outlines the field of science, as the 
term is usually employed with reference to general education, 
Barker’s Physics. ApvancEeD Course. 
By GEORGE F. BARKER, Professor in the University of Pennsylvania, 
x-+ 902 pp. 8vo. 
A comprehensive text-book, for higher college classes, 
rigorous in method, and thoroughgoing in its treatment of the 
subject as distinctly the science of energy. The matter is 
presented under the general heads of Mass Physics, Molecular 
Physics, and Physics of the ther. The iast division, which 
occupies half of the volume, is subdivided into Energy of 
Ether Vibration (Radiation), Energy of Ather Streess (Elec- 
trostatics), Energy of ther Vortices (Magnetism), and 
Energy of Aither Flow (Electrokinetics). The most 
approved mathematical methods of deriving the formulas 
are given, but the student unacquainted with the Calculus 
must of course be content to take the formulas on faith. 
The illustrations are largely diagrammatic, and most of them 
have been prepared especially for this work. 
London Chemical News:—The| Francis H. Smith, Professor in 
oest truly modern manual of phy-| University of Virginia:—The work 
sics in our language, is up to date as regards facts. It 
Chas. R. Cross, Professor in| shows excellent judgment, in my 
Massachusetts Institute of Tech-\ opinion, as to what it leaves out. 
nology :—There is no other text-|.. . It is judicious in its scientific 
book that seems to me so well] “ perspective,” giving due relative 
adapted for high-grade teaching in| prominence to the several subdi- 
general physics. visions. 
