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 |
|________________|_____________|_____________|______________|

The final conclusion drawn from these results is that the method of
Hoffmeister yields a product containing variable proportions of
hemicelluloses. These are eliminated