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 lark 

 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. ADVANCED COURSE. 



By GEORGE F. BARKER, Professor in the University of Pennsylvania. 

 x 4- 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 ^Ether. The last division, which 

 occupies half of the volume, is subdivided into Energy of 

 yEther Vibration (Radiation), Energy of yEther Streess (Elec- 

 trostatics), Energy of /Ether Vortices (Magnetism), and 

 Energy of /Ether 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. 



Francis H. Smith, Professor in 

 University of Virginia: The work 



London Chemical News: The 

 best truly modern manual of phy- 

 sics in our language. 



Chas. R. Cross, Professor in 

 Massachusetts Institute of Tech- 

 nology : There is no other text- 

 book that seems to me so well 

 adapted for high-grade teaching in 

 general physics,, 



is up to date as regards facts. It 

 shows excellent judgment, in my 

 opinion, as to what it leaves out. 

 It is judicious in its scientific 



' perspective," giving due relative 

 prominence to the several subdi- 



visions. 



