NATURAL SCIENCE. 



Elements of Physics. 



A Text-book for High Schools and Academies. By ALFRED P. GAGE, 

 A.M., Instructor in Physics in the English High School, Boston. 12mo. 

 424 pages. Mailing Price, $1.25; Introduction, $1.12; Allowance for old 

 book, 35 cents. 



rTlHIS treatise is based upon the doctrine of the conservation of 

 energy, which is made prominent throughout the work. But 

 the leading feature of the book one that distinguishes it from 

 all others is, that it is strictly experiment-teaching in its method ; 

 i.e., it leads the pupil to "read nature in the language of experi- 

 ment." So far as practicable, the following plan is adopted : The 

 pupil is expected to accept as fact only that which he has seen or 

 learned by personal investigation. He himself performs the larger 

 portion of the experiments with simple and inexpensive apparatus. 

 such as, in a majority of cases, is in his power to construct with the 

 aid of directions given in the book. The experiments given are 

 rather of the nature of questions than of illustrations, and precede 

 the statements of principles and laws. Definitions and laws are not 

 given until the pupil has acquired a knowledge of his subject suffi- 

 cient to enable him to construct them for himself. The aim of the 

 book is to lead the pupil to observe and to think. 



C. F. Emerson, Prof, of Physics, 

 Dartmouth College : It takes up the 

 subject on the right plan, and pre- 

 sents it in a clear, yet scientific, way. 



Win. Noetling, Prof, of Rhetoric, 

 Theory and Practice of Teaching, 

 State Normal School, Bloomsburg, 

 Pa. : Every page of the book shows 

 that the author is a real teacher and 

 that he knows how to make pupils 

 think. I know of no other work on 



the subject of which this treats that 

 I can so unreservedly recommend to 

 all wide-awake teachers as this. 



B. F. Wright, Supt. of Public 

 Schools, St. Paul, Minn.: I like it 

 better than any text-book on physics 

 I have seen. 



0. H. Roberts, Prin. of High 

 School, San Jose, Gal.: Gage's Phys- 

 ics is giving great satisfaction. 



