In large 8vo, with Bibliography, Illustrations in the Text, and seven 

 Lithographed Plates. 12s. 6d. 



THE MEAN DENSITY OF THE EARTH : 



An Essay to which the Adams Prize was adjudged in 

 1893 in the University of Cambridge. 



BT 

 J. H. POYNTING, Sc.D., F.R.S. 



[Late Fellow of Trinity College, Cambridge; Professor of Physics, 

 Mason University College, Birmingham. 



" An account of this subject cannot fail to be of OKEAT and GENERAL INTEREST 

 to the scientific mind. Kspecially I? this the case when the account is given by 

 one who has contributed so considerably as has Prof. Poynting to our present 

 state of knowledge with respect to a very difficult subject. . . . Remarkably has 

 Newton's estimate been verified by Prof. Poynting." Athenaum. 



LONDON : CHARLES GRIFFIN & CO., LIMITED, EXETER STREET, STRAND. 



