Dr. Pearson's Observations 
412 
had been absorbed by the solution, and which also was afforded 
by the dissolution of the remaining metal. 
The whole quantity of nitrous gaz varied, with the same as 
well as with different metals, between 60 and 85 ounce-mea- 
sures ; but either from my own inability to observe, or from 
the circumstances on which this variety depended being un- 
known, I cannot explain the reason of such differences in the 
result. 
( c ) After the solution (6) had stood several days, the clear 
blue liquor was decanted, and filtrated, from the white sedi- 
ment : and pure water was poured upon the filter repeatedly, 
till what passed through was colourless, and almost tasteless. 
The filtrated liquid was boiled to evaporate all but about six 
ounces ; and it deposited, on standing, a small quantity of 
white sediment. 
The white sediment, from the solution (6), being dried, 
amounted to the following different quantities, from 300 grains 
of each of the different metals, namely, 
1. The sauce-pan, exclusive of a little dirty extraneous 
matter, - - 65 grains, or zipper cent. 
2. The spear-head, exclusive of a^ little dirty extraneous 
- 63 grains, or 21 per cent. 
— 55 grains, or 18 \per cent. 
The lituus, - - 54 grains, or 18 per cent. 
The scabbard, - 48 grains, or ib per cent. 
The celt. No. 1. - 42 grains, or 14 per cent. 
The celt, No. 2. - 42 grains, or 14 per cent. 
( d ) The decanted and filtrated liquid ( c ) being duly eva- 
porated to crystallization, was found to contain nothing but 
nitrate of copper, and sometimes a very minute portion of 
matter, - 
3. The celt. No. 3. 
