ADVERTISEMENT. 



The following is a first supplement to Part I. of a general work on the 

 "Constants of Nature," gratuitously prepared for the Smithsonian Institu- 

 tion by Professor F. W. Clarke, and published at the expense of its fund. 



Part I., on Specific Gravities, Boiling Points and Melting Points, was 

 published in 1873, since which time the new determinations have been made 

 and collected which form this supplement. 



JOSEPH HENRY, 



Secrt tary Smithsonian Institution. 

 Washington, April, 1S76. 





