water ceases to dissolve anything. The residue dried
at 212 deg. Fahrenheit is weighed with a filter, after which that of the
latter is deducted. The loss of weight experienced is essentially
equal to the loss of the wool fiber. If the filtrate is saturated with
hydrochloric acid, the dissolved wool fiber separates again, and after
having been collected upon a weighed filter, it may be weighed and the
quantity ascertained.

The weight of the mineral substances in the raw paper is ascertained
by analyzing the ash in a manner similar to that above described. The
several constituents of the ash and the mineral added to the raw paper
are ascertained as follows: Sufficient of the paper is calcined in the
manner described; a known quantity of the ash is weighed and thrown
into a small porcelain dish containing a little distilled water and an
excess of chemically pure hydrochloric acid. In this solution are
dissolved the carbonates, carbonate of lime, carbonate of magnesia, a
little of sulphate of alumina, as well as metallic oxides, while
silicate of magnesia, silicic acid, sulphate of lime (gypsum) remain
undissolved. The substance is heated until the water and excess of
free hydrochloric acid have been driven off; it is then moistened with
a little hydrochloric acid, diluted with distilled water and heated.
The undissolved residue is by filtering separated from the dissolved,
the filter washed with distilled water, and the wash water added to
the filtrate. The undissolved residue is dried, and after the filter
has also been burned in due manner and the ash added, the weight is
ascertained. It consists of clay, sand, silicic acid and gypsum.

The filtrate is then poured into a cylinder capable of holding 100
cubic centimeters, and furnished with a scale; sufficient distilled
water is then added until the well-shaken fluid measures precisely 100
cubic centimeters. By means of this measuring instrument, the filtrate
is then divided into two equal portions. One of these parts is in a
beaker glass over-saturated with chemically pure chloride of ammonia,
whereby any iron of oxide present and a little dissolved alumina fall
down as deposit. The precipitate is separated by filtering, washed,
dried at 212 deg. Fahrenheit and weighed. To the filtrate is then added a
solution of oxalate of ammonia until a white precipitate of oxalate of
lime is formed. This precipitate is separated by filtering, washed,
dried and when separated from