1835.] Heat af Bodies to their Atomic Weights, 43 



to be considered as consisting of ^ atom sodium and 1 

 atom chlorine. The calculated specific heat will then 



be ^ — = '214, the experimental result was •221. 



The atom of Chloride of mercury or corrosive sublimate, 

 if viewed as constituted of I an atom mercury and 2 atoms 

 chlorine, will yield the following result : — 



- 4.05 = '0693. Now the number derived from 



experiment was -069. The number calculated from the 

 atom adopted on the Continent would be '0694. 



The atom of potassium, Avogrado considers ought to be 

 reduced to the fourth of what it is at present. The chloride 

 of potassium would then consist of 2 atoms chlorine -h 1 



potassium. Hence we have ^ — = -193. There- 



1.10 /o 



suit of an experiment by Avogrado was '184. If we adopt 

 the continental number for potash, we should have -197 as 

 the calculated specific heat. 



5. Salts. — Avogrado determined the specific heat of five 

 sulphates in the anhydrous state, and Neumann has obtained 

 the specific heat of four mineral sulphates. In these, it is 

 necessary to consider the atom as consisting of -J atom of 

 oxide and ^ atom sulphuric acid. The following table ex- 

 hibits the specific heat of six different sulphates, ascertained 

 by calculation and experiment. 



observed, calculated. 



Sulphate of lime ..... 0-188 - 0.175 



iron 0-145 - 0-160 



" copper .... 0-180 - 0*167 



barytes .... 0-108 - 0-103 



" strontian ... 0*136 - 0-131 



lead 0-085 - 0-079 



The sulphates of soda and zinc would require to be 

 divided by 8, but their specific heat has not been properly 

 ascertained. Neumann found by an examination of the 

 sulphates that the stechiometrical numbers, that is the pro- 

 duct of the specific heat multiplied by the comjpound atom, 

 was 1*546. Reducing the atoms to one half, according to 

 the view of Avogrado, we obtain -773 for the number, 



