OF ARTS AND SCIENCES. 35 



Weiffht after heatinw for some time at ) ^ Aonr\ 



OS, K 9,4200 grammes. 



from 175'' to 195° I * 



Weight after conversion 210'' . . . . 9.4200 „ 



Loss at either temperature 0.0042 „ 



Loss calculated for whole amount of Sb^Sg 0.0044 „ 



Only a very faint sublimate was formed, but we noticed a very 

 marked empyreumatic odor. We therefore infer that the loss of weight 

 was caused wholly by the decomposition of the occluded tartaric acid, 

 and on dissolving the gray sulphide in hydrochloric acid we obtained a 

 large amount of carbonaceous residue, which was collected on a paper 

 disk, and weighed. 



Weight of paper disk, dried 0.0280 grammes. 



„ „ „ „ and residue . . . 0.0400 „ 



„ ,; residue 0.0120 



Weight of residue calculated for whole 



amount of SbgSg 



Hence we have — 



0.0126 



Weight of Sb^Sg dried at 130°, as before 3.3539 grammes. 

 Loss on heating to 210*^ . . . 0.0044 

 Carbonaceous residue .... 0.0126 0.0170 „ 



Estimated as pure SKSg 3.3369 



Weight of antimony taken 2.3843 



Weight of sulphur in combination . . . 0.9526 „ 



: 9526 : 2.3843 = 48 : 120.14, the resulting value of Sb, whether we 

 take the red or the gray sulphide. 



The above examples will illustrate how the results were obtained 

 which are tabulated on pages 36-7. 



