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An attempt has been made to show that the course of cellulose reactions in which the latter's hydroxyl groups are involved is governed by its physical structure (microscopical and sub- microscopical) as well as by the chemical nature of its hydroxyl groups. It would seem that for reasons not yet always clearly understood either one or the other of the two factors predomi nates— i.e., the physical accessibility of the hydroxyl groups, as dependent upon the crystalline- to-amorphous ratio, or their intrinsic chemical reactivity, as dependent upon the position of the hydroxyl groups in the anhydroglucose units. Practically all cellulose reactions may be grouped into four main "possibilities." These are discussed and illustrated by concrete examples, such as oxidation with various agents, etherification and esterification, sorption of water, exchange with heavy water, the action of sodium metal in liquid ammonia, and various other reactions.

Acknowledgment, is due G. E. Landt for suggesting the problem and for his valuable advice concerning the investigation, and to C. R. Lynam for his help in constructing the casting apparatus. Appreciation is extended also to the twenty-eight, plastic manufacturers (see Table II) who supplied the materials tested.BIBLIOGRAPHY

Dentaohbnd und den n6rdliohen wie W h e n Gebiotun Knlllandr mit EirlschluB Sibiriena emcheinen. Riga ist eomit mch der 01%. .PO die dcuteche Rirtechaft Mnftig einen guten Teil jener hochd i g e n Waren hcrstellcn a4rd, dnrch welohen sie ihre beaondere Stellung auf dcm Weltmarkt einnimmt. Welche maligebende Be-~ deutnng a k r cine wuwnschdtlich-hhnisobe hhrtmatalt, gleichsam ein Nervenzentrum dea Wirtachaftaktirpem fiir einc solche Entwioklung hat. braucht in I)euteohlend nicht erst paohgcwiesou su werden. Mittel am beiden Bestimmnngen 13.30% Furfurol. Reohnot mnn d i m auf Xylan um, 80 ergeben eich 22,34q/, XyLan Furfurol x 1,68 = Xylan). Die Rohcelluloee enthiilt aleo erhebiche Mengen Xylan. Fur die Ermittlung d a w a b n Celldcwecehnltee im Stroh hat man somit ~tets in der dwch ChlorieNng rbgesobiedenen Celliilope daa Xylnn (Pentoeen) tii h i m m e n und n Abzug cu hringen: 51.60 g Rohoelluloee enthalten noch 11.63 g Xylan, 54,M g Celluloee und Xylan

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