406 ZINC, CADMIUM, LEAD, &c. 



distilled by a gentle heat, the perchloride ob- 

 tained would probably be neutral ; but I have 

 not tried to prepare it in this way. 



of u !fn urets 5 ' The sul P nurets *' tin > which are two in 

 number, likewise furnish decisive evidence of 

 the atomic weight of tin. 



The protosulphuret of tin may be obtained by 

 melting together tin and sulphur in a glass tube, 

 and keeping up the heat till the excess of sul- 

 phur is sublimed. When 7*25 grains of pure tin 

 are thus converted into sulphuret, the weight 

 of the new compound is 9*25. Hence it is a 

 compound of 



1 atom tin . . 7-25 

 1 atom sulphur . 2 



9-25 



The persulphuret has been long known by the 

 name of Mosaic gold. It is under the form of 

 light scales, of a brownish yellow colour, and 

 great beauty and lightness. It is soluble in ni- 

 tromuriatic acid, and likewise in potash ley. 

 The analysis of this sulphuret of tin by Dr. John 

 Davy is sufficient to prove that it is a compound 

 of 



r atom tin . . 7-25 

 2 atoms sulphur . 4 



11-25 



