ADVERTISEMENT. 



The following forms the fourth part of a general work on the 

 " Constants of Nature," of which the first three are as fol- 

 lows : 



Part I and' Supplement. — Specific Gravities, Boiling Points and 

 Melting Points, by F. W. Clarke. 



Part II. — A Table of Specific Heats for Solids and Liquids, by 

 F. W. Clarke. 



Part III. — Tables of Expansion by Heat for Solids and Liquids, 

 by F. W. Clarke. 



The manuscript of the present work has been presented to the 

 Smithsonian Institution by Mr. G. F. Becker and is published at 

 the expense of its fund. 



' S. F. BAIRD, 



Secretary Smithsoyiian Institution. 



Washington, August, 1880. 



Ill 



