our's duration. On adding sulphuric acid to the solutions the product
was precipitated. Yield 40 p.ct. Analyses:

C 43.8 43.8 43.7
H 6.2 6.2 6.3

The cellulose reprecipitated from solution in Schweizer's reagent gave
similar analytical results:

C 43.9 43.8 44.0
H 6.5 6.3 6.4

_Conversion into nitrates._--The original cellulose, hydral- and acid
cellulose were each treated with 10 times their weight of HNO_{3} of
1.48 sp.gr. and heated at 85 deg. until the solution lost its initial
viscosity.

The products were precipitated by water and purified by solution in
acetone from which two fractions were recovered, the one being
relatively insoluble in ethyl alcohol. The various nitrates from the
several original products proved to be of almost identical composition,

C 32.0 H 4.2 N 8.8

with a molecular weight approximately 1350. The conclusion is that
these products are all derivatives of a 'hydralcellulose'
6C_{6}H_{10}O_{5}H_{2}O.

FORMATION OF FURFURALDEHYDE FROM CELLULOSE, OXYCELLULOSE, AND
HYDROCELLULOSE.

By LEO VIGNON (Compt. rend., 1898, 126, 1355-1358).

(p. 54) Hydrocellulose, oxycellulose, and 'reduced' cellulose, the last
named being apparently identical with hydrocellulose, were obtained by
heating carefully purified cotton wool (10 grams) in water (1,000 c.c.),
with (1) 65 c.c. of hydrochloric acid (1.2 sp.gr.), (2) 65 c.c. of
hydrochloric acid and 80 grams of potassium chlorate, (3) 65 c.c. of
hydrochloric acid and 50 grams of stannous chloride. From these and some
other substances, the following percentage yields of furfuraldehyde were
obtained: Hydrocellulose, 0.854; oxycellulose, 2.113; reduced cellulose,
0.860; starch, 0.800; bleached cotton, 1.800; oxycellulose, prepared by
means of chromic acid, 3.500. Two specimens of oxycellulose were
prepared by treating cotton wool with hydrochloric acid and potassium
chlorate (A), and with sulphuric acid and potassium dichromate (B), and
25 grams of each product digested with aqueous potash. Of the product A,
16.20 grams were insoluble in potash, 2.45 grams were precipitated on
neutralisation of the alkaline solution, and 6.35 grams remained in
solution, whilst B yielded 11.16 grams of insoluble matter, 1.42 grams
were precipitated by acid, and 12.42 grams remained in solution. The
percentage yields of furfuraldehyde obtained from these fractions were
as follows: A, insoluble