22 
Dr. Wollaston’s Synoptic Scale i &c. 
Water contained in aystallizcd Sails. 
Sulphate of Copper 
Sulphate of Iron 
Sulphate of Zinc 
Sulphate of Magnesia 
Glauber Salt 
Muriate of Barytes - 
(45) 100 
: 36.3 : 
: 156,6 
56,8 — 
5 X 11,36' 
(46) 100 
: 454 : 
: 173*8 
79*0 = 
7 X 1 1,28 
(47) 100 
: 444 : 
: 180,2 
79,8 = 
7 X 1 1,40 
(48) 100 
: 514 : 
: 153*9 
li 
7x11,33 
( 49 ) 
: 56 : 
: 202,3 
113,1 = 
lox 11,31 
50) 100 
: 14,8 : 
: 153*6 
22,8 r: 
2x 11,48^ 
)^Water (ty) 
(45) Berzelius (46) Ditto (47) Lost by heat (48) By heat (49) Bcrzell 
(50) Ditto. 
In this table I have selected in most cases double evidence 
from different sources, in order that the inferences mi^ht re- 
ceive confirmation from their concurrence. Number (29) 
may be noticed as a result anticipated from preceding data, 
and found to coi?icide with remarkable accuracy. 
In the distillation of nitric acid from nitre, the whole of the 
acid may be obtained, if we employ enough of sulphuric acid 
to convert the residuum into bi-sulphate of potash. In this 
case each portion of potash, from which dry nitric acid is 
separated, will displace the water from two equivalent quan- 
tities of sulphuric acid, and each portion of nitric acid weigh- 
ing 67,54 will be found combined with 22,64 of water. Hence 
90,18 of liquid nitric acid so obtained should dissolve the 
equivalent 63 of carbonate of lime. And in fact, by an expe- 
riment carefully conducted on a large scale by Mr. Phillips,* 
it appears that 681^ of such acid did dissolve 476 of marble, 
which is in the proportion of 90,18 to 62,96, corresponding 
with the estimate within ~oo ^ degree of coincidence 
rarely to be found even in the repetition of the same experi- 
ment by the most skilful analyst. 
The specific gravity of this acid was found' to be 1,50. 
* Experimental Examination of the Pharm. Lend, by R. Phillips. 
