HARPER'S LIBRARY OF 

 LIVING THOUGHT 



Foolscap Svo, gilt tops, decorative covers, richly gilt backs 

 Per Volume : Cloth 2s. 6d. net, Leather 35. 6d. net 



THE ELEMENTS: 



SPECULATIONS AS TO THEIR NATURE 

 AND ORIGIN 



By Sir W. A, Tilden, F.R.S., OSc, t LLJX, etc. 



Illustrated 



" Sir William Tilden stands firmly on 

 the earth of our present physical know- 

 ledge, and tells us how far from such a 

 standpoint science can see into 'un- 

 original night and chaos old.' With 

 modern theories of matter and elec- 

 tricity, and their astounding suggestive- 

 ness, it is easy to dream about the 

 primal condensation of ' protyle ' into 

 atoms, and anyone who wishes to do so 

 will find plenty of hints in Sir William's 

 clear concise chapters ; he limits his 

 speculations, however, to the probable, 

 and refuses the offers of imagination to 

 carry him into the merely possible." 

 Manchester Guardian. 



"The best thinkers of the day on matters of vital 

 importance and profound interest." Liverpool Post. 



