6 



that the condensation of steam being in multiple proportion with the 

 other thermal equivalents, the expansion of all other bodies into 

 vapour must be included ; for I showed in the Philosophical Maga- 

 zine for January 1852 (page 48), that all bodies expand into vapour 

 in some multiple of their atomic volumes, and their atomic volumes 

 being in ratio also, their expansion or gain of internal space in this 

 definite change must be hi multiple proportion. 



TABLE showing the quantity of heat produced in 1000 grs. of water 

 by the oxidation of an equivalent of each substance, 0=1. 



Note. I proved in a paper published in the Philosophical Maga- 

 zine for October 1851, that " the decomposition of a compound body 

 absorbs as much heat as the combination of the elements originally 



