he Polyporus
cellulose is correlated with its exceptionally low nitrogen. By actual
isolation of a crystalline dextrorotary sugar, by preparations of
osazone and conversion into saccharic acid, it was proved that dextrose
was the main product of hydrolysis. The second main product was shown to
be acetic acid, the yield of which amounted to 8 p.ct. in several cases.

Generally, therefore, it is proved that the more resistant tissue
constituents of the fungi are not cellulose, but a complex of
carbohydrates and nitrogenous groups in combination, the former being
resolved into glucoses by acid hydrolysis, and the latter yielding
acetic acid as a characteristic product of resolution together with the
nitrogenous groups in the form of an uncrystallisable syrup.

In the further prosecution of these investigations (2) the author
proceeded from the supposition of the identity of the nitrogenous
complex of the original with chitin, and adopted the method of
Ledderhose (Ztschr. Physiol. Chem. 2, 213) for the isolation of
glucosamin hydrochloride, which he succeeded in obtaining in the
crystalline form. In the meantime E. Gilson had shown that these tissue
substances in 'fusion' with alkaline hydrates yield a residue of a
nitrogenous product (C_{14}H_{28}N_{2}O_{10}), which is soluble in
dilute acids [Recherches Chim. sur la Membrane Cellulaire des
Champignons, La Cellule, v. II, pt. 1]. This residue, which was termed
mycosin by Gilson, has been similarly isolated by the author. It is
proved, therefore, that the tissues of the fungi do contain a product
resembling chitin. [See also Gilson, Compt. Rend. 120, 1000.] This
constituent is in intimate union with the carbohydrate complex, which is
resolved similarly to the hemicelluloses. Various intermediate terms of
the hydrolytic series have been isolated. But the only fully identified
product of resolution is the dextrose which finally results.

UEBER DIE KOHLENHYDRATE D. HEFE.

E. SALKOWSKI (Berl. Ber., 27, 3325).

~ON THE CARBOHYDRATES OF YEAST.~

The author has isolated the more resistant constituents of the
cell-membrane by boiling with dilute alkalis, and exhaustively purifying
with alcohol and ether.

The residue was only a small percentage (3-4 p.ct) of the original, and
retained only 0.45 p.ct. N.

It was heated in a digester with water at 2-3 atm. steam-pressure, and
thus resolved into approximately equal portions of soluble cellulose
(a) and insoluble (b). The l