44 



On the Relation of the Specific 



[July 



and •1932 the fourth of the latter, which does not differ 

 much from '1875. 



In carbonate of lime thenumberof atoms are indicated by 

 the formula, 1+1 + ^ + 1=3, which being divided by 

 4, gives -75, the square root of which is 0*866 x 1875 = 

 •1624. Now taking the 8th of the atom of carbonate of 

 of lime we have %\\%\^ = 0-207. The specific heat by 

 experiment was found to be '203. The stechiometrical num- 

 ber deduced from an examination of the carbonates is 

 •1892. The correspondence of the calculated and observed 

 specific heats of the carbonates is presented in this table. 



observed, calculated. 



6. Minerals. — Neumann has determined the specific heat 

 of several natural silicates. Common felspar, according to 

 the views of Avogrado, will consist of 1 atom potassium 

 and ^ atom oxygen forming potash ; 1 atom aluminum + f 

 atom oxygen forming alumina, and 3 atoms silicon + 3 

 atoms oxygen forming silica, or altogether 1 atom potas- 

 sium + 1 aluminum + 3 silicon + 4 oxygen. If the weight 

 of the atom be 8-8537, and the constituent number 9, then 

 we have for the latter number the expression |^, the square 

 root of which is 1-0608 x '1875 = '1989, and the atom is 

 reduced to - \^.^ ^ = 1-1067; the calculated specific heat is 

 tlien 7^^ =-1797. Neumann found -1911 by experi- 

 ment, and -1861 for adularia. In the case of albite or 

 soda felspar, it is necessary to consider the atom divided by 

 16 . its constituent number will be (taking for a numerator 

 17 made up of 1 sodium + 2 aluminum -f 6 silicon -f 8 

 oxygen = 17,) fj, of which the square root is 1-0308 x 

 -1875 = 1937, the weight of its atom is ^-^p^ = 1-0446, 

 and the calculated specific heat is rirr-^ = 0-1851. Neu- 



■,., . A. 0445 



mann obtamed by experiment -1961. 



Hydrous sulphate of lime affords by calculation for the 

 specific heat -259. Neumann found it -2727. 



