ted.

Lustra-celluloses:

Chardonnet Converted into a blue-black charcoal, retaining the
Lehner form ofthe fibres.

Pauly A bright yellow-brown colouration, without carbonisation.

17. The _losses of weight_ accompanying these changes and calculated per
100 parts of fibre dried at 100 deg. were:

China silk 3.18
Tussah silk 2.95

Lustra-celluloses:

Chardonnet 33.70
Lehner 26.56
Pauly 1.61

18. _Inorganic constituents._--Determinations of the total ash gave for
the first five of the above, numbers varying from 1.0 to 1.7 p.ct. The
only noteworthy point in the comparison was the exceptionally small ash
of the Pauly product, viz. 0.096 p.ct.

19. _Total nitrogen._--The natural silks contain the 16-17 p.ct. N
characteristic of the proteids. The lustra-celluloses contain 0.05-0.15
p.ct. N which in those spun from collodion is present in the form of
nitric groups.

The points of chemical differentiation which are established by the
above scheme of comparative investigation are summed up in tabular form.

_Methods of dyeing._--The lustra-celluloses are briefly discussed. The
specific relationship of these forms of cellulose to the colouring
matters are in the main those of cotton, but they manifest in the
dye-bath the somewhat intensified attraction which characterises
mercerised cotton, or more generally the cellulose hydrates.

_Industrial applications_ of the lustra-celluloses are briefly noticed
in the concluding section of the book.

FOOTNOTES:

[3] With these products it is easy to observe that they have a definite
fusion point 5 deg.-10 deg. below the temperature of explosion.

SECTION III. DECOMPOSITIONS OF CELLULOSE SUCH AS THROW LIGHT ON THE
PROBLEM OF ITS CONSTITUTION

UEBER CELLULOSE.

G. BUMCKE und R. WOLFFENSTEIN (Berl. Ber., 1899, 2493).

(p. 54) _Theoretical Preface._--The purpose of these investigations is
the closer characterisation of the products known as 'oxycellulose' and
'hydracellulose,' which are empirical aggregates obtained by various
processes of oxidation and hydrolysis; these processes act concurrently
in the production of the oxycelluloses. The action of hydrogen peroxide
was specially investigated. An oxycellulose resulted possessing strongly
marked aldehydic characteristics. The authors commit themselves to an
explanation of this paradoxical result, i.e. the production of