66 Dr. de Crell on the Decomposition 
obtained two drams and four grains of white salt : the resi- 
duum upon the filter weighed four grains. 
Exp. xxvii. This salt [Exp. xxvi.) I again exposed to the 
fire ; when it yielded from twenty to thirty drops of acid liquor, 
four grains of sublimate, and a residuum, which, being dissolv- 
ed, yielded one dram and thirty-three grains of salt, and left 
two grains and a half, c, upon the filter. 
The same salt, (obtained by Exp. xxvi.) being distilled, be- 
came of a brownish-grey colour ; and, besides a few drops of 
fluid, yielded not quite two grains of sublimate. On treating the 
residuum with water, it yielded sixty-eight grains of salt, and 
there were not quite two grains left upon the filter. 
Exp. xxvii i. On treating these sixty-eight grains of salt in 
the same manner, they yielded a few drops of fluid, and two 
grains of sublimate : after filtration, there remained forty-eight 
grains of salt, and a residuum of hardly one grain and a half. 
Exp. xxix. The same salt, treated in the same manner, 
yielded a few drops, and a little sublimate ; and, after filtra- 
tion, thirty-five grains of salt, and a residuum of hardly one 
grain. 
Exp. xxx. On treating these thirty-five grains of salt in the 
same way, they yielded, besides a very small quantity of fluid 
and of sublimate, twenty-four grains of salt, and about three 
quarters of a grain of residuum. 
As I now discovered that the quantity of salt was continually 
decreasing, and some coal separating from it, I thought it su- 
perfluous to endeavour to decompose the above twenty-four 
grains any farther. 
Exp. xxxi. The residuum, 0, of Exp. xxn. was light, blackish, 
