r paper | 96.58 | -- | 84.76 | -- | --
Ordinary filter paper | 98.17 | 93.39 | 86.58 | -- | --
Cotton ('wool') | 98.38 | 89.98 | 63.96 | 67.88 | --
Jute | -- | -- | 57.93 | 71.64 | 75.27
Purified wood | -- | -- |{49.27 | -- | --
| | |{46.56 | |
Raw wood | 47.60 | -- |{40.82 | -- | --
| | |{38.87 | |
--------------------------------------------------------------------------

The final conclusion drawn from the results is that none of the
processes fulfil the requirements of an ideal method. Those which may
be carried out in a reasonably short time are deficient in two
directions: (1) they yield a 'cellulose' containing more or less
oxycellulose; (2) the celluloses themselves are attacked under the
conditions of treatment, and the end product or cellulose merely
represents a particular and at the same time variable equilibrium, as
between the resistance of the cellulose and the attack of the reagents
employed; this attack being by no means confined to the non-cellulose
constituents. Schulze's method appears to give the nearest approximation
to the 'actual cellulose' of the raw material.

* * * * *

(p. 8) ~SOLUTIONS OF CELLULOSE~--(1) ~ZINC CHLORIDE.~--To prepare a
homogeneous solution of cellulose by means of the neutral chloride, a
prolonged digestion at or about 100 deg. with the concentrated reagent is
required. The dissolution of the cellulose is not a simple phenomenon,
but is attended with hydrolysis and a certain degree of condensation.
The latter result is evidenced by the formation of furfural, the former
by the presence of soluble carbohydrates in the solution obtained by
diluting the original solution and filtering from the reprecipitated
cellulose. The authors have observed that in carefully conducted
experiments cotton cellulose may be dissolved in the reagent, and
reprecipitated with a loss of only 1 p.ct. in weight. This, however, is
a 'net' result, and leaves undetermined the degree of hydration of the
recovered cellulose as of hydrolysis of the original to groups of lower
molecular weights. Bronnert finds that a previous hydration of the
cellulose--e.g. by the process of alkaline mercerisation and removal of
the alkali by washing--enables the zinc c