11 



SCIENCE. -ADVERTISEMENTS. 



•..THE— 



NEW KNOWLEDGE 



A popular account of the New Physics and the New Chemistry in 

 their Relation to the New Theory of Matter. By ROBERT 

 KENNEDY DUNCAN, Professor of Chemistry in Washington and 

 Jefferson College. With many illustrations. 



There Is a New Knowledge in the World 



THE CAUSE OF THE HEAT OF THE SUN 



THE liVl/VlORTALlTY OF THE UNIVERSE 

 RADIO=ACTIVITY 

 THE BIRTH AND DECAY OF HATTER 



A TANGIBLE CONCEPTION OF ETERNITY 



All these are locked up in the NEW KJSOWLEDGE that is revolu- 

 tionizing the thought of the day. 8vo. $2.00 net 



A. S. BARNES & CO., 156 Fifth Avenue, New York. 



Send for Circular of The New Knowledge Series. 



V)c ^ 



OLIVEt^ 



TypeWri'ter 



The Standard Visible Typewriter 



Its Record has never been Equaled 



CATALOGUE FREE 



THE OLIVER TYPEWRITER COMPANY 

 310 Broadway, New York 



JUST READY 



The HORSE 



ISAAC PHILLIPS ROBERTS 



is for the everyday man who loves a 

 horse, who needs one for farm work, 

 for business, for pleasure. He de- 

 scribes the breeds, and shows the uses 

 to which each is adapted, freely illus- 

 trating from excellent photographs. 

 He tells how to judge a horse during 

 inspection before purchase ; shows 

 how the breeding, care and education 

 of horses may add appreciably to one's 

 income, and give incalculable pleasure 

 and benefit. 



394 pages, 95 illustrations, and valuable tab' es 

 and other appendices 

 Cloth, ^1.25 net (postage 9c.) 



THE MACMILLAN COMPANY 



Publishers, 64-66 Fifth Awe., New York 



