se._--From the hydrocelluloses variously prepared the
author obtains 0.8 p.ct. furfural; from bleached cotton 1.8 p.ct.; and
from the oxycelluloses variously prepared 2.0-3.5 p.ct. The 'furfuroid'
is relatively more soluble in alkaline solutions (KOH) in the cold. The
insoluble residue is a normal cellulose.

(c) _Nitrates of cellulose, oxy- and hydro-cellulose._--Treated with
the usual acid mixture (H_{2}SO_{4} 3 p., HNO_{3} 1 p.) under conditions
for maximum action, the resulting esters showed uniformly a fixation of
11.0 NO_{2} groups per unit mol. of C_{24}. The oxycellulose nitrate
was treated directly with dilute solution of potassium hydrate in the
cold. From the products of decomposition the author obtained the osazone
of hydroxypyruvic acid [Will, Ber. 24, 400].

(d) _Osazones of the oxycelluloses._--Oxycelluloses prepared by
various methods are found to fix varying proportions of phenylhydrazine
(residue), viz. from 3.4-8.5 p.ct. of the cellulose derivative reacting,
corresponding with, i.e. calculated from, the nitrogen determined in the
products (0.87-2.2 p.ct.). The reaction is assumed to be that of osazone
formation.

The author has also established a relation between the phenylhydrazine
fixed and the furfural which the substance yields on boiling with
condensing acids. This is illustrated by the subjoined series of
numbers:

Phenylhydrazine Furfural
Fixed p.ct. formed p.ct.
Cotton (bleached) 1.73 1.60
Oxycellulose (HClO_{3}) 7.94 2.09
" (HClO) 3.37 1.79
" (CrO_{3}) (1) 7.03 3.00
" (CrO_{3}) (2) 7.71 3.09
" (CrO_{3}) (3) 8.48 3.50

(e) _Constitution of cellulose and oxycellulose._--The results of
these investigations are generalised as regards cellulose (C_6) by the
constitutional formula

CH--CH_{2}
/ | |
(CHOH)_{3} O |
\ | |
CH--O .

The oxycelluloses contain the characteristic group

COH
/
(CHOH)_{3}
\
CH--CO
\ /
O

in union with varying proportions of residual cellulose.

QUANTITATIVE SEPARATION OF CELLULOSE-LIKE CARBOHYDRATES IN VEGETABLE
SUBSTANCES.

WI