the Water of Kilburn Wells. * 123 
EXPERIMENT II. 
The dry residuum obtained as above was rubbed with a little 
alcohol, and a sufficiency of this spirit having been added, the 
whole was placed in a gentle warmth, and often stirred with a 
glass tube : after a few days the fluid was decanted, and what 
remained indissoluble, having been edulcorated with alcohol, 
and carefully collected and dried in a moderate warmth, was 
found to weigh 1392 grains ; so that 168 grains had been taken 
up by the alcohol. 
The spirituous solution was gently evaporated, when 180 
grains of a yellowish, easily deliquescent salt remained, having 
a bitter and acrid taste. By adding to this one ounce of the 
strongest alcohol, all the deliquescent salts were dissolved, 
leaving 40 grains of a saline substance ; which having been 
again dissolved in distilled water and crystallized, was found 
to be common salt. 
The solution of the deliquescent salts having been mixed 
with 20 drops of pure vitriolic acid, some selenite appeared; 
the whole was now evaporated to dryness, and having been 
mixed with of its weight of pure vitriolic acid, it was exposed 
to a considerable heat. The vapours thus expelled were those 
of the muriatic acid. When these had ceased, and the mass 
was cold, I again dissolved it in distilled water, when a black 
flaky substance was separated, which being carefully collected 
on filtering paper, and dried, weighed six grains ; this was re- 
sinous matter. 
The solution was now placed on the fire, in order to evapo- 
ration, during which 12 grains of selenite were separated ; the 
remainder afforded vitriolated magnesia, leaving some drops 
of a yellowish fluid, from which, by the addition of caustic 
R 2 
