339 
formerly supposed to be Zeolite , &c. 
some sulphat of lime also made its appearance, which washed 
with diluted alcohol and dried in a low heat = T V of a grain. 
(3. ) A portion of the fluid remained which neither the addi- 
tion of potash nor the lapse of many weeks could induce to 
crystallize. Suspecting that it might contain glucine, I preci- 
pitated the contents by carbonat of ammonia, added to excess, 
and shook the mixture repeatedly and strongly. The precipi- 
tated earth was collected and the fluid boiled, but it was found 
to contain nothing but a minute portion of alumina. 
( 4. ) The edulcorated earth was redissolved in sulphuric acid, 
except f of a grain of ignited silica. 
The solution was mixed with a little potash, and gradually 
evaporated. Sulphat of of lime was separated at several times 
and after long intervals, which sufficiently washed and dried in 
a low heat = Some silica also separated, but too minute in 
quantity to be ascertained by weight. The remaining fluid at 
length crystallized into regularly formed alum. 
(5.) The whole, therefore, of the 32^ (E. 3.) consisted 
of alumina except 2 J of silica, and the lime contained in of 
sulphat of lime, which may be estimated about of a grain ; 
the alumina, therefore, = 29 ; the alumina in B. and D. = -§4 ; 
the silica in B, D, and F, =3^; the oxide of iron (D.) 
= T 3 -, and lime F, T 3 T ; the volatile parts of this substance = 1 5-g- 
in the 50 grains employed. 
The sum total of these is - 47 tV 
Loss ------ 2-t-f* 
3 ° 
I have subjected these crystals, as well as the harder species 
of this mineral, to analysis by means of direct solution in 
X x 2 
