206 



ESSAY XVIII. 



was cool, some small long acid crystals were found, togethe 

 with a small quantity of white powder, which I separat( 

 from it, and then poured some more nitrous acid upon the 

 remaining mass, and, on evaporation, more such crystals 

 appeared. The same process was repeated several times, by 

 which means the whole mass was at last changed into such 

 crystals, which weighed about 5 drms. This salt showed in 

 every respect phenomena like those produced by the acid of 

 sugar. 



SECTION IV. 



The above-mentioned white powder, which weighed 7J 

 drms., I took at first to be saccharated lime, because I 

 thought that as milk always contains a little lime, it might 

 enter into the sugar as one of its constituent parts, and 

 then, by combining with the acid of sugar, would consequently 

 form the saccharated lime. But two experiments which I 

 made with it show that I was mistaken in my conjecture. 

 I poured a solution of acid of sugar into a solution of sugar 

 of milk, but no precipitation ensued. I further found that 

 this powder burned in a red hot crucible like oil, without 

 leaving any mark of ashes behind. 



SECTION V. 



Lime-water seemed to have no sensible effect upon this 

 powder ; but boiling water dissolved some of it, though but 

 a very little ; for one part of this powder required sixty parts 

 of boiling water for its solution. After the solution was 

 cooled, one-fourth part of the powder separated again from 

 the water in the form of very small crystals. The remaining 

 mass being then collected by evaporating the water from it, 

 a small quantity of acid of sugar, constituting about one- tenth 



