vpon llie Mixtures oJTm and Jntimoiiy. 403 



A like mixture being set to boil, a similar proportion of four 

 parts of antimony was found dissolved at the end of three hours. 



Tiie dissolution of these four parts in both cases appeared to 

 be greatly owing to the presence of sulpiuu-et of antimony in 

 theantiinony employed, a sliglit disengagement of sulplunctted 

 hydrogen gas having been o!)served during the dissolution. 



I next made two mixtures: one containing equal parts of tin 

 and of antimony, and another 25 parts of antimony and 75 of 

 tin. 



The first of these mixtures, tliougli harder than antimony, was 

 so brittle that it broke on falling to the ground, and v;as very 

 easily reduced to a fine powder. Its specilic weight, estimated 

 with" much care, was found to be 6'S03, the water distilled 

 forming I . 



The second mixture, the si>ecific weight of which was found to 

 be 7-059, was first flattened with a hammer and then slightly 

 chopped. It was easy to perceive that the tin had, with the 

 smaller proportion of antimony here combined, already lost 

 somewhat of its ductility. 



The following are the experiments wliich 1 made on these 

 mixtures : 



FirsL Experiment. One hundred parts of the first mixture, 

 containing equal parts of tin and antimony, with an equal pro- 

 portion reduced to a fine powder, were heated and treated with 

 hydrochloric acid : — the action seemed very slight ; the metal 

 preserved its whiteness and its metallic brilliancy. After about 

 three hours of ebullition I filtered the mixture, and found that 

 33 parts of the metal had been dissolved. 



Second Experiment. One hundred parts of the second mix- 

 ture, containing twenty-five parts of antimony and seventy-five 

 of tin, after being beaten very thin, were heated and treated wit!) 

 hvdrochloric acid. The action was much greater than in the 

 preceding experiment ; the metal from being perfectly white 

 became slightly browned. After an hour of ebullition, no in- 

 crease of action appearing, I filtered, and found that 53 parts of 

 the metal had been dissolved. 



From these two experiments it was easy to gee that the anti- 

 mony, besides being itself nearly insoluble in the hydrochloric 

 acid, served to counteract the dissolution of the tin; and that in 

 proportion as there was less of antimony in the mixture, there 

 was niOre of the tin dissolved. 



followed. This yellow colour is tindoulitedly owing to t\ certain ciuanliry 

 ofcliloiiiK-, Ibrmod at the expense of the oxygen of a parj, of tiie water .Ic- 

 coniposed, and whidi from its tendency lo a gabcoiis elate diM^ngajrcs itself 

 oi» liic aL'italloii of the lifiuid. 



C c 2 0.1 



