NATURE SERIES 



POPULAR LECTURES 



AND 



ADDRESSES 



BY 



SIR WILLIAM THOMSON (BARON KELVIN) 



P.R.S., LL.D., D.C.L., &c. 



PROFESSOR OF NATURAL PHILOSOPHY IN THE UNIVERSITY OF GLASGOW, AND 

 FELLOW OF ST. PETER'S COLLEGE, CAMBRIDGE 



IN THREE VOLUMES 

 VOL. II 



GEOLOGY AND GENERAL PHYSICS 



WITH ILLUSTRATIONS 



( 



H o n to o n 



M A CM I L LAN AND CO. 



AND NEW YORK 

 1894 



The Right of Translation and Reproduction is Resented 



