34 PROCEEDINGS OP THE AMERICAN ACADEMY 



Here the antimonial sublimate was but small, and the carbonaceous 

 residue was evidently the preponderating cause of error. Hence, a 

 result decidedly below the average. But, even if we subtract the 

 whole of the combustible portion of this residue and leave the opposite 

 errors uncompensated, we only raise the resulting value to 120.78. 



Details op Determination marked 13 D. 



"Weight of nacelle and antimony . . . 8.2578 grammes. 

 5> » » D.2o22 „ 



Weight of antimony transferred to flask . 2.0056 „ 



The metal was dissolved with 30 cubic centimetres of hydrochloric 

 acid and 5 cubic centimetres of decim-nitric acid, as in last example. 

 But more tartaric acid, 25 grammes, was used, and in addition 20 

 cubic centimetres of hydrochloric acid were added to the water in the 

 large flask before pouring in the solution through the platinum tunnel. 



First weight of platinum tunnel and antimony bullets, 95.5825 grammes. 

 Second „ „ „ „ „ „ „ 95.2038 „ 



"Weight of antimony dissolved during reduction . . 0.3787 



„ „ „ as above 2.0056 „ 



Total weight of antimony taken 2.3843 „ 



Here the same remarks apply as were made at the corresponding 

 stage of the previous example. 



Weight of small paper disk 0.0436 grammes. 



„ „ large platinum crucible . . 180.8315 „ 



180.8751 

 Weight of crucible, filter, and SbjSg ■ . 184.2290 „ 



Weight of Sb^Sg, dried at 130° . . . . 3.3539 „ 



Most of the precipitate was transferred to a platinum nacelle, and 

 heated as before described. 



Weight of platinum nacelle 6.2518 grammes. 



„ „ „ „ andSb^Sg . 9.4242 „ 



Weight of SbgSg transferred .... 3.1724 „ 



