Nature's fllMrades: 



FAMILIAR TALKS ON SCIENCE. 



By PROF. ELISHA GRAY. 



VOL. I-Wotto Glutting an& Xife : 



jEattb, Bfr, ant> 1C\atcv. 



VOL. ii. jner0B an& Dibration : 



fforce, Ibeat, %tgbt, Sounb, J6n>losfv>es. 



VOL. in. ElectrfcftB an& flfcagnettem. 



ELISHA GRAY is a name known and honored by scien- 

 tific men the world over. Farmer's boy, blacksmith ap- 

 prentice, ship-joiner,.carpenter, self-supporting through a 

 college course ; his genius interested him in electricity, 

 and in that realm his Inventions have made him famous. 

 These, with his organization and presidency of the Con- 

 gress of Electricians at the Columbian Fair of 1893, and his 

 many decorations and degrees, conferred at home and 

 abroad, all stand sponsors for his fame. 



These little volumes convey scientific truth without 

 technical terms, and are enriched with reminiscence, 

 anecdote, and reflections that allure and hold the interest. 



" The place held by Elisha Gray in the scientific world 

 has been won not by catering to the applause of the pub- 

 lic, but by a life dev9ted to original investigation in un- 

 trodden fields." Chicago Times-Herald. 



Handy Volumes, 4^ x 6% ; Cloth ; 60 cents per Volume. 



FORDS, HOWARD, & HULBERT, 

 47 East loth St., New York. 



