82 PROCEEDINGS OF THE AMERICAN ACADEMY 



The antimony was next dissolved without the aid of heat in 30 cubic 

 centimetres of hydrochloric acid mixed with 5 cubic centimetres of 

 decim-nitric acid. Before complete solution had taken place, the flask 

 was connected with a reversed condenser, and the solution boiled until 

 every trace of the metal had disappeared. Next, the antimony bullets, 

 previously prepared as described, were added, and the boiling continued 

 until the solution was perfectly colorless. To this solution, after cool- 

 ing, was added 20 grammes of tartaric acid, dissolved in about twice 

 its own weight of water, and the solution transferred, in the manner 

 before described, to an Erlenmeyer flask holding about two litres. 



First weight of platinum tunnel and antimony bullets, 96.8646 grammes. 

 Second „ „ „ „ „ „ „ 96.5267 „ 



Weight of antimony dissolved during reduction . 0.3379 

 „ „ „ as above 2.0038 



Total weight of antimony taken 2.3417 „ 



The surfaces of the bullets were not disintegrated, and there was no 

 appeai'ance of any antimony powder arising therefrom. After precipi- 

 tation, at the ordinary temperature, the precipitate was gently digested 

 for some time with a large excess of H^S -|- Aq before heating the liquid 

 to the boiling point. Every detail was successful. The precipitate 

 was washed six times, and collected as usual by reverse filtering in a 

 large platinum crucible, and dried in air bath at from 120*^ to 130* C. 



Weight of small paper disk 0.0388 grammes. 



„ „ large platinum crucible . . 180.8345 „ 



180.8733 

 Weight of crucible, filter, and Sb2S3 . 184.1580 



Weight of red Sb,S,3, dried at 130° . . 3.2847 „ 



A portion of the dried precipitate was dissolved in hydrochloric acid. 

 It gave no residue. The rest was then . transferred to a platinum 

 nacelle, and heated, as has been described, in a current of pure and dry 

 hydrogen gas. 



Weight of platinum nacelle 6.2616 grammes. 



„ „ „ „ and Sb,S, 9.0480 



Weight of Sb^Sg transferred 2.7864 



