131 
Dr C. G. Grneiin’s Analysis of Cinnamon-stone . 
cess of carbonate of ammonia. The liquor was separated by the 
filter from the undissolved part, and evaporated. A white sub- 
stance fell down, which, after ignition, weighed 0.0463 gr. ~ 
1.485 per cent. Considering the manner in which this subtance 
had been obtained, one might have taken it for Glucine, Ittria, 
or Zircon, but it was pure Alumina ; and when dissolved in sul- 
phuric acid by digestion, and mixed with a little ammonia, it 
crystallized entirely into alum. It follows, hence, that when alu- 
mina is precipitated by means of carbonate of ammonia, it is not 
advisable to add the latter in great excess ; and that the com- 
mon method used to separate glucine from alumina does not 
yield it perfectly pure. 
What had been left undissolved in f was dissolved in muria- 
tic acid, evaporated in order to drive off the excess of acid, and 
then boiled with caustic potash in excess. The alkaline solution 
was separated from the brown-precipitate by the filter, and the 
alumina contained in it thrown down in the ordinary manner. 
It weighed after ignition 0.6705 gr. = 21. 511 per cent. 
n. The brown residue in g was dissolved in muriatic acid, 
the solution boiled with nitric acid, and the iron now precipita- 
ted by succinate of ammonia. There' were obtained 0.1143 gr. 
of oxide of iron, =r 3.666 per cent. 
i. The liquor remaining after the separation of iron, was now 
boiled with a solution of sub-carbonate of potash. A precipitate 
fell down, which, after ignition, weighed 0.0343 gr., and which 
was found to be lime with some traces of manganese. It must, 
therefore, be accounted for 0.620 per cent, of lime. 
The cinnamon-stone is accordingly composed of, 
Silica, - 
40.006 
Oxygen. 
20.12 
Alumina, 1.485 (f) 
21.511 (g) 
22.996 
10.74 
Lime, 25.919 (c) 
4.034 (d ) 
0.620 (i) 
30.573 
8.59 
Oxide of Iron, 
3.666 (h) 
1.11 
Potash, - 
0.589 (e ) 
Trace of Manganese. 
Volatile matter, 
- 0.326 (a ) 
1 <-v 
98.156 
