Lxpeiieiicfs in acting iifmi Atcoh<iL 297 



coiiipdsed depjjsits itself. As tliere is then no loiigor enough of 

 Ijnie to saturate the whole of the acid completely, a part remains 

 untouched. 



"borne sulphuric acid poured into a solution of new salt pro- 

 duced a precipitate. The acid which is formed during the course 

 of its evaporation causes the same effect. It is clear that the 

 acid of this salt is not sulphiuic acid, since it is disengaged from 

 its bftse hv this latter acid ; but is tliis another acid, or is it only 

 a modification, as I have advanced ? This is the point to be de- 

 termined. In order to ascertain the fact, I mixed this salt re- 

 duced to powder with the half of its weight of pounded char- 

 coal ; and having calcined it, I obtained sulphuret of li»ne. 



" If the first experiment has demonstrated that this acid is not 

 wdphuric acid, tiie latter proves at least that it is a modification 

 of it. It now only remains for me to prove that the difference 

 of tliis acid from sulphuric acid is owing to its containing less 

 oxygen. 



*' Having accordingly paswd a current of oxygen gas through 

 a solution of new salt, and having left these two bodies in contact 

 for some time, a precipitate was formed, which I found to be 

 sulphate of lime. In another experiment, having boiled a solu- 

 tion of salt with nitric acid, the nitrous gas was disengaged, and 

 a salt deposited in parallelipipedal crystals, which I ascertained 

 to be sulphate of lime. It appears thus to me well established 

 by these two experiments, that the new acid differs from the sul- 

 phuric acid only by its containing less oxygen than the latter. 



" The residue of the ether treated with carbonate of barytes, 

 in the same manner as it had been with the carbonate of lime, 

 presented me with the same phosnomena ; only the salt which 

 is deposited when a solution to which nitric acid has been added 

 is heated, does not crystallize, and the deposit takes place when 

 the li(iuor begins to boil. 



" The salt which I obtained with the barytes was irregularly 

 rrystallized ; it had a sharp and somewhat styptic taste, dissolv- 

 ing in nearly fifteen times its weight of cold water j it dissolves 

 in about an eighth of hot water. 



" in boiling the saltof lime with carbonate of potash, I obtained 

 a bitter salt of a micaceous crystallization, which requires six 

 parts of cold water to be held in solution. 



" Salt of s(Kla, prepared in the same manner as the preceding, 

 crystallizes in parallclipipeds, two sides of which are straighter 

 than the others ; it dissolves in double its weight of cold water, 

 nnd with the carbonate of ammonia a very soluble salt is obtain- 

 ed, which crystallizes partly in cubes and jiartly in octahedrons. 



" From thi^ series of experiments it results very clcaily ; 1st, 

 Vol.yj.tio.'lCA. /}[»il{^t^). Z ' That 



