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. 



HPHIS 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. 



Wm. Noetling, State Normal 

 School, Bloomsburg, Pa. : I know of 

 no other work on the subject that 

 I can so unreservedly recommend to 

 all wide-awake teachers as this. 



Benj. F. Thomas, Prof, of Physics, 

 Ohio State University : I have used 

 it with preparatory classes for sev- 

 eral years with satisfaction. I re- 

 gard it as the best for class-room 

 work. 



H. Wilson Harding, Prof, of 



Physics, Lehigh University : I be- 

 lieve Gage's Elements of Physics to 

 be based on the true method of study- 

 ing that branch of science, that of 

 practical work in the laboratory by 

 the student himself. 



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. 



