OP ARTS AND SCIENCES. 33 



Weight after heating to 175° for half an hour . . 9.0433 grammes. 

 „ „ half an hour longer . 9.0433 „ 



Loss at this temperature 0.0047 „ 



Loss calculated for whole amount of SbjSg . . . 0.0055 „ 



Weight after heating to 210°, and converting to ) 9 Q43Q grammes, 



gray modification ) 



Total loss after conversion ........ 0.0050 



Loss calculated for whole amount of SbgSg . • . 0.0059 „ 



At 175° we observed a distinct sublimate, and at 210° a slight 

 addition to it. 



Weight of red Sb^Sg, as above .... 3.2847 grammes. 

 Loss when dried at 175° 0.0055 „ 



Corrected weight of red Sb^Sg .... 3.2792 

 Weight of antimony taken 2.3417 



Weight of sulphur in combination . . 0.9375 „ 



0.9375 : 2.3417 = 48 : 119.90, resulting value of Sb. 



Weight of red Sb2S8, as before .... 3.2847 grammes. 

 Loss when dried at 210°, and converted . 0.0059 „ 



Corrected weight of gray sulphide . . 3.2788 

 Weight of antimony taken 2.3417 



Weight of sulphur in combination . . . 0.9371 „ 



0.9371 : 2.3417= 48 : 119.94, the resulting value of Sb. 



During the drying and conversion of the precipitate, there was a 

 distinct empyreumatic odor, and on dissolving the gray sulphide in 

 hydrochloric acid a considerable amount of black residue, This resi- 

 due was collected on a weighed disk of paper, and examined. 



Weight of carbonaceous residue calculated for whole ) /^ nn'ro „ 



" . . y O.UO/o grammes, 



precipitate ) 



Weight of incombustible portion 0.0013 „ 



„ „ combustible portion 0.0065 „ 



VOL. XIII. (n. s. v.) 3 



