CONTENTS. 



POLAR ICE-CAPS AND THEIR INFLUENCE IN 



CHANGING SEA LEVELS 319 



Being Paper read before the Geological Society of 

 Glasgow, February 16, 1888. 



ON THE RATE OF A CLOCK OR CHRONOMETER 

 AS INFLUENCED BY THE MODE OF SUS- 

 PENSION 360 



Being a Paper read before the Institution of 

 Engineers in Scotland, February 27, 1867. 



ON A NEW ASTRONOMICAL CLOCK 387 



Being a Paper read before the Royal Society, 

 June 10, 1869. 



ON BEATS OF IMPERFECT HARMONIES .... 395 



Being Paper read before the Royal Society of 

 Edinburgh, April \st, 1878. 



ON THE ORIGIN AND TRANSFORMATION OF 



MOTIVE POWER 418 



Being Friday Evening Lecture before the Royal In- 

 stitution, February 29, i8$6 ; from Proc. R. I., 

 republished in Vol. II. of Mathematical and 

 Physical Papers. 



ON THE SOURCES OF ENERGY IN NATURE 

 AVAILABLE TO MAN FOR THE PRODUC- 

 TION OF MECHANICAL EFFECT 433 



From Presidential Address to the Mathematical and 

 Physical Section of tlie British Association, 

 York, 1 88 1. 



ON THE DISSIPATION OF ENERGY 451 



Being article in ' ' The Fortnightly Review, " March, * 



1892. 



