1815,] “of Dunblane: and Pitcaithly. 263 
noni . Grain. 
Muriate of soda ...ss.seeeeeeseeones 249 boil | 
Muriate, of lime, ...0..0,0 06025 oeecis ee gay NhsGp 
Sulphate of lime 2... ..eseeee crew ens 29 
Carbonate of UIMPin <6 006 cab mam aeogaysU ws 
With a trace of iron. we 
‘457 
Having completed the analysis in this manner, I wished to con- 
firm it by a different method. A very simple one presented itself — 
to reduce by evaporation to dryness—obtain the sulphate of lime as 
before—then, dissolving the mixed mass of muriate of lime and 
muriate of soda in water, decompose the muriate of lime by oxalate 
of ammonia, so as to find the quantity of it present, and after eva- 
poration to volatilize the muriate of ammonia by heat, and thus 
obtain the muriate of soda. The results in this mode ought to cor- 
respond with those in the former; and the one, therefore, afford 
a confirmation of the other, or lead to the discovery of any fallacy 
if it exist. 
A pint of the water was evaporated to dryness, and afforded, as 
before, 47 grains of solid matter. This being submitted to the 
action of a small quantity of distilled water, was dissolved, with the 
exception of a residue of sulphate of lime, which weighed 2°6 
grains, and a little carbonate of lime, which may be estimated, as 
before, at 0°5 grain. . 
’ To the clear solution a solution of oxalate of ammonia was added 
as long as any turbid appearance was produced ; and after the pre- 
cipitate had subsided, the liquor was heated nearly to boiling, to 
render the mutual action and the precipitation more perfect. The 
precipitate being repeatedly washed with distilled water, was dried 
by the heat of a sand-bath raised gradually, and kept lower than a 
red heat. It weighed 21 gr. ‘The quantity of muriate of lime which 
would be equivalent to this cannot be inferred with certainty from any 
previous analysis of oxalate of lime; for as the oxalate cannot be 
exposed toa red heat without decomposition, it cannot easily be 
subjected to a precise degree of heat, by which we can be certain of 
obtaining it in an uniform state of dryness.* Jt is necessary, there- 
fore, that in every case the quantity of lime should be found in the 
oxalate that is operated on. ‘The above quantity of 21 grains was 
eonverted by ealcination into carbonate of lime ; and this being 
decomposed by mutriatic acid, the quantity of muriate of lime ob- 
tained, dried at a low red heat, and weighed while warm, amounted 
to 18°3 grains. Sey 
The liquor poured off from the precipitate was evaporated to 
drjuess ; and to expel the muriate of ammonia formed by the action 
» ™ Meferving to those analyses which may be supposed to, he most accurate 21 
grains of oxalate of lime will be found equivalent to various proportions, rom 
Lib to 19°9 of tnuriate of lime. a OF IRIS 
