CHROMIUM. 47 



of antimony forms an integrant particle of sul- 

 phuret of antimony; while the atom of hydro- 

 gen uniting with the atom of oxygen, forms an 

 integrant particle of water. 



6. That sulphuret of antimony is composed 

 one atom of each of its constituents, is obvious mon y 

 from the following experiment : 5-5 grains of 

 pure antimony in powder were fused with a 

 quantity of flowers of sulphur in a covered cm* 

 cible, the temperature of which was gradually 

 raised till the excess of sulphur was driven off. 

 The weight of the sulphuret formed was J'5 

 grains; consequently, the antimony had combined 

 with C 2 grains of sulphur. Now, 5%5 represents the 

 weight of an atom of antimony, and 2 the weight 

 of an atom of sulphur. 



SECT. III. 



OF THE ATOMIC WEIGHT OF CHROMIUM. 



CHROMIUM is a white coloured brittle metal, 

 which is not affected by the magnet, and which 

 combines with three proportions of oxygen, and 

 forms three oxides. The protoxide has a fine Oxides of 

 green colour, the deutoxide is brown, and the 

 peroxide, commonly called chromic acid, has a 

 very deep yellowish red, or extremely dark 



