1815.) of Dunblane and Pitcaithly 269 
as. any vapours exhaled, and at the end being raised to redness. The 
muriate of soda thus obtained weighed 13-4 grains, By solution 
and crystallization it was obtained in cubes, 
The precipitate of oxalate of lime having been thoroughly washed, 
was exposed in a sand-bath to a heat short of redness, until it had 
ceased to exhale any vapours, and appeared perfectly dry; it 
weighed 23-8 grains. ‘The portion of muriate of lime equivalent to 
any quantity of oxalate of lime cannot, as has been already re- 
marked, be exactly assigned, from the difficulty of bringing the 
oxalate to one uniform state of dryness. But, according to the mos® 
accurate analyses, 23°8 grains of dry oxalate are equivalent to 20 
grains of dry muriate. ‘To avoid any error, however, the oxalate 
was converted into carbonate of lime by calcination; and this, de« 
composed by muriatic acid, afforded 19°5 grains of dry muriate of 
lime. : 
The proportions, then, of the saline ingredients in an English 
pint of the Pitcaithly water are, according to this analysis, 
Grains. 
Mrarinte OF sodas bv:ases oly oe seine since: phot 
WO MACE: Of AMI si sah eiahs ferns tape erst eine Be, [he U5 
Sulphate of lime 4.60.6 s/scccceseccees | OD 
Canbohate Of MINE.) duce geles oe unr verona OD 
To which are to be added of acrial ingredients, 
’ Cubic Inch, 
Atmospheric ait’... 50 s0cceesceecceesce OD 
CREDO ACID PAS... a> c:)0,0 sob eifhe 46 Bh 
It also gives slight indications of the presence of iron; but as far 
as can be judged from the shade of colour produced by tincture of 
galls, the quantity is much smaller than in the Dunblane water. It 
does not admit, therefore, of being determined with much accuracy 
by actual experiment. ; 
After L had completed the preceding analysis, a view occurred to 
me with regard to the composition of these waters, different from 
that which has been stated above; and which, if just, may lead to 
conclusions of some interest with regard to the constitution of mine- 
ral waters of the saline class. ‘This I have lastly to illustrate. 
(To be continued.) 
Articie III. 
Some Olservations on the Analysis of Organic Substances. 
By Dr. Prout. 
_ Benzenius, has lately extended the doctrine of definite propor- 
tions to the principles of organic nature, and has very satisfactorily 
