NATURAL SCIENCE. 



Principles of Physics. 



A Text-bnok for High Schools and Colleges. By Alfred P. Gage, 

 Instructor of Physics In the English High .Sihool, Boston. 12mo. 

 Half leather, ix + 034 pages. Illustrated. Mailing price, .si. 45; for 

 introduction, .sl.oU. 



fPHIS book aijus to supply the demand for an accurate, interestr 



ing, usable text-book of present-day Pliysics, suitable for high 

 schools and elementary courses in college. 



The text is so arranged that three distinct courses may be laid 

 out: the high school course, the elementary college course, and an 

 eclectic course more or less full as the circumstances require. 



Each of these courses will be found thorough so far as it at- 

 tempts to go, and each is so -nritteu as to be adapted to the 

 maturity of those by whom it is to be followed. 



Recent developments of the science receive due attention, and 

 particular care has beeir used to distinguish the fairly proved 

 from the speculative. 



Though not attempting to be a complete treatise, this new book 

 will be found to include all, it is believed, that teachers expect or 

 desire to find in an advanced general text-book on Physics. 

 L. T. Edwards, Professor of Me- Ludovic Estes, Professor of 



dianical Engineering, Haverford 

 College, Haverford, Pa. : I shall 

 take great pleasure in using it 

 in connection with my work at 

 Haverford College. 



Science, I'nioersity of Xorth Dct- 

 Icota, Grand Fork, X. Dak.: It is 

 the best adapted for my purposes of 

 any elementary text>book on that 

 subject. 



J. P. Nelson, Professor of Civil Geo. T. Sean, Instructor in Phy- 

 Engineering, State College of Ken- j sics, High School, Minneapolis, 

 tucky, Lexington, Ky. . It is an ex- Minn.. After four months' expe- 



cellent book. Its purpose is clearly 

 kept in view, and such matter as is 

 needed to satisfy the students of a 

 brief college course has been handled 

 perfectly. 



rience with the book, I am free to 

 say that it is a most satisfactory text. 

 Its plan is certainly logical, and the 

 ground covered is most thorough. 



