[ 26 ] 
ounce of it afforded 31 grains of hepatic air, When diffolved 
in water the refiduum of an ounce was 357.grains of a grey 
earth that appeared to be calcareous for the moft part. The 
folution itfelf was of a yellow colour and {trongly fulphureous, 
With the folution of allum it did not. effervefce ftrongly until 
a good deal was added, The precipitate was of a dirty white, 
and amounted to 66 grains, of which two appeared to be fulphur. 
Hence its quantity of vegetable alkali is nearly 93 grains per 
ounce. 
Mr. Crarke’s REFINED AsH: 
Tus I obtained from Mr. Crarxe himfelf. It is of a yellowith 
white colour, with greenifh fpots; many pieces are externally 
white and internally green; it is moderately hard, of a very 
fharp tafte, and effervefces with acids, 
An ounce of this fubftance diffolved in twelve ounces of boiling 
water did not effervefce with acids, but precipitated the folution 
of fublimate corrofive yellow and red as lime water does, and left 
a refiduum of 17 grains, which was evidently calcareous. A 
folution of two ounces of this fubftance being impregnated with 
fixed air in Doctor Noorn’s machine, depofited 5 grains of mild 
calcareous earth ; but a folution made in three or four times its 
weight of water, or without the affiftance of heat, contained no 
lime, and effervefced flightly with acids; and when this falt is 
fome time expofed to the air, its folution contains no lime. 
A soLuTion of one ounce of this falt precipitated 89 grains 
of earth of allum, and therefore contained 129 grains of mere 
vegetable 
