GALLIUM. 55 



P. LouYET : 19 (0 = 16). 



Determined bj' six experiments on the conversion of fluor- 

 spar into calcic sulphate. The mean result was 100 parts 

 spar equal 174. S6 sulphate, with an extreme difference of 

 0.3, Spar from Derbyshire was pulverized, digested with 

 chlorhydric acid, and the foreign matter removed by lutra- 

 tion in water. It w^as completely dissolved in sulpliuric acid, 

 the excess of which was driven off by heat continued 

 till a constant weight was obtained. S = 200 ; Ca = 250. 

 {Erdmami's Journ. fur Prak. Chem., ^7, 1849, 104 ; Annal. de 

 Chim. ctde Fhjs., (3,) 25, 1849, 291.) 



E. Fremy. 



This chemist says that his analyses essentially confirm 

 Berzelius' determination. {Annal. de Chimie et de Phys., (3,) 

 4.7, 1856, 27.) 



J. Dumas : 19 (O = 16). 



Determined bj'the conversion of fluorides into sulphates. 

 A single experiment on the conversion of calcic fluoride 

 gave 18.96 ; two experiments on sodic fluoride, 19.06 ; and 

 two on potassic fluoride, 18.99. The mean is 19.01; ex- 

 treme diflerence, 0.12. Ca = 20 ; Na = 2o ; K = 39 ; S = 

 16. The alkaline salts were well crystallized and were fused 

 before use. (Annal. de Chim. et de Phys., (3,) 56, 170.) 



S. DE Lucca : 18.96 (O = 16). 



Determined by four experiments on the conversion of a 

 pure spar from Gerfalco into sulphate. The extreme difler- 

 ence was 0.15, The decomposition was very difficult. The 

 loss on ignition and the residue left on evaporation of the 

 acid employed were taken into consideration. [S apparently 

 = 16; Ca = 20.] {Paris Comptes Bendus, 51, 1860, 299.) 



GALLIUM. 



Berthelot has determined the specific heat of gallium at 

 0.079 corresponding to an atomic heat of 5.52, if the atomic 

 weight is 69.9. {Paris Comptes Bend., 86, 1878, 786.) 



