1. Green plants of false oat grass (_Arrhenatherium, E._). 2. Green plants of lucerne (_Medicago sativa_). 3. Leaves of the ash (_Fraxinus_). 4. Leaves of the walnut (_Juglans_). 5. Roots of the purple melic grass (_Molinia caerulea_). 6. Roots of dandelion (_Taraxacum officinale_). 7. Roots of comfrey. 8. Coffee berries. 9. Wheat bran. These raw materials were treated for the quantitative estimation of cellulose by the method of Lange (b), Hoffmeister (c), and Schulze (d), and the numbers obtained are referred for comparison to the corresponding yields of 'crude fibre' (Rohfaser) by the standard method (a). As a first result the author dismisses Lange's method as hopeless: the results in successive determinations on the same materials showing variations up to 60 p.ct. The results by c and d are satisfactorily concordant: the yields of cellulose are higher than of 'crude fibre.' This is obviously due to the conservation of 'hemicellulose' products, which are hydrolysed and dissolved in the treatments for 'crude fibre' estimation. A modified method was next investigated, in which the process of digestion with acid chloroxy- compounds (c and d) was preceded by a treatment with boiling dilute acid. The yields of cellulose by this method (e) are more uniform, and show less divergence from the numbers for 'crude fibre.' The author's numerical results are given in a series of tables which include determinations of proteids and ash constituents, and the corresponding deductions from the crude weight in calculating to 'pure cellulose.' The subjoined extract will illustrate these main lines of investigation. ___________________________________________________________ | | | | | | Crude Fibre | Pure Cellulose | | |_____________|____________________________| | | | | | | Raw Material | Weende | Hoffmeister | Hoffmeister, | | | Method. | Method. | modified by | | | (a) | (c) | Author. | | | | | (e) | |________________|_____________|_____________|______________| | | | | | | Oat grass | 30.35 | 34.9 | 31.5 | | Lucerne | 25.25 | 28.7 | 20.5 | | Leaves of ash | 13.05 | 15.4 | 13.8 | | Roots of melic | 21.60 | 29.1 | 21.4 | | Coffee beans | 18.30 | 35.1 | 23.3 | | Bran | 8.2 | 19.3 | 9.3 | |________________|_____________|_____________|______________|