OF ARTS AND SCIENCES. 363 



reagents act with acid sodic carbonate, sodic phosphate, oxalic acid, 

 and even water. The composition of the precipitate formed witli 

 mercuric nitrate is discussed below. The hot solution of the amide 

 also gives with mercurous nitrate a white precipitate, which becomes 

 gray on standing, but no precipitate with solutions of the salts of any 

 of the other common metals. 



The Silver Salt CgH3(S02NHAg)3 was made by adding argentic 

 nitrate to a hot solution of the amide, and then amnionic hydrate, but 

 not in excess, as this dissolves tlie precipitate ; if by accident an excess 

 has been added, the precipitate can be obtained again by boiling off the 

 ammonia. The fiocculent white precipitate thus formed was washed 

 with water, dried in vacuo, and analyzed. 



0.2778 grm. of the salt gave by precipitation from its solution in 

 dilute nitric acid 0.1886 grm. of argentic chloride. 



Calculated for C6H3(S02NHAg)3. Found. 



Silver 50.94 51.11 



It is a tolerably stable white powder, insoluble in water, soluble in 

 nitric acid or ammonic hydrate. When a little tincture of iodine is 

 added, the silver is converted into argentic iodide. Compare the 

 analogous reaction with the mercuric salt. 



Mercuric Salts of Benzoltrisiilphamide. — When the amide is boiled 

 with yellow mercuric oxide suspended in water, a white precipitate is 

 formed, the composition of which varies according to the proportion of 

 oxide and amide used. 



CeH.(SO,NHHgOH)3. — To prepare this salt, 0.65 grm. of mer- 

 curic chloride was converted into the oxide by precipitation with sodic 

 hydrate, and the washed but not dried oxide boiled with a solution of 

 0.25 grm. of the amide. The action takes place very slowly even under 

 these conditions (much more slowly and imperfectly if the oxide has 

 been dried) ; but after boiling for twenty-four hours it was nearly com- 

 plete, although there were still a few yellow specks of oxide visible. 

 These were separated mechanically, as far as possible, and the precipi- 

 tate washed and dried at 100°; its analysis is given under I. The 

 same salt is obtained much more conveniently by adding a solution of 

 mercuric nitrate to a boiling solution of the amide, and washing with 

 boiling water. An analysis of the salt thus prepared, and dried at 

 lOO'', is given under II. It is probable that the mercuric nitrate forms 

 at first the compound C,;H.(SO^,NHHgN03)3, and that this is decom- 

 posed by the hot water in the same way that mercuric nitrate itself is. 



