364 Analysis of the Chalybeate Spring at Thetford. 
put aside; and then in eighty times its weight of distilled water. 
The insoluble residue was soluble in muriatic acid. ; 
Exp. 4.—The muriatic solution was mingled with nitric acid 
and evaporated to dryness, heated red hot, and again dissolved 
in a small portion of muriatic acid. It afforded by liquid ammonia 
eight grains of oxide of iron, which indicate 2°75 grains of car- 
bonate of iron in each gallon of the water. 
Exp. 5.—The alcoholic solution (Experiment 2) having been 
suffered to stand exposed to the open air for twelve days afforded 
a crystalline mass. The uncrystallizable portion was mixed with 
sulphuric acid, and heated till the colour of litmus paper em-+ 
ployed for covering the basin in which the process was conducted, 
did not suffer a change of colour. The solid residue was digested 
in a small quantity of water, and the insoluble part separated by 
the filter. The soluble portion was decomposed by subcarbonate 
of potash;—the precipitate afforded with muriatic acid thirteen 
grains of muriate of magnesia; therefore 3:25 grains of this salt 
were contained in a gallon of the chalybeate water. 
Exp. 6.—The insoluble residue of Experiment 5, after being 
boiled in a solution of subcarbonate of potash, became readily 
soluble in nitric acid. This solution was decomposed by sub- 
carbonate of ammonia, and the product, after being mingled 
with muriatie acid, again evaporated to dryness, and strongly 
heated, gave 2°25 grains of muriate of lime to a gallon of water. 
Exp. 7.—The analysis being thus far conducted, an alcoholic 
solution obtained as before stated, and equal to that operated 
on, was evaporated to dryness—covered with sulphuric acid, and 
again evaporated to perfect dryness. ‘This mass digested in a 
small quantity of water afforded copious crystals of sulphate of 
magnesia. ‘he residuary insoluble substance was soluble by 
boiling in water, and decomposable by nitrate of barytes,—and 
lastly, a similar alcoholic solution was mixed with muriatic acid, 
and decomposed by subcarbonate of potash, and the product 
heated to redness. Thus carbonate of iron and the muriates of 
lime and magnesia were clearly established in the water. 
Exp. 8.—The first portion of the aqueous solution obtained in 
process 3, after being concentrated toa bulk of five cubic inches, 
was not affected by muriate of platina nor oxalate of ammonia. It 
was diluted with alcohol, which occasioned a crystalline precipi- 
tate. to fall down. The remaining fluid was evaporated, and at- 
tempted to be crystallized. The salt produced being muriate of 
soda,was dissolved in water together with the saline mass obtained 
in process 5, and decomposed by nitrate of silver. The preci- 
pitate produced, taking 235 grains of muriate of silver to be equal’ 
to 100 of muriate of soda, indicated 2-125 muriate of soda in 
one gallon of the water. 
Exp. 
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