ropriate
chemical means; but the fact that there is a special chemistry of the
product has rendered its industrial progress slow. The work of the last
five years in this, as in other applications of cellulose in its many
derived forms, has resulted in a considerable addition to the domain of
practical chemistry.

Further developments will make an increasing demand upon our grasp of
the fundamental constitutional problems, to which it is the main purpose
of the present volume to contribute.

FOOTNOTES:

[11] This is the most complete notice that has appeared and the
bibliography is exhaustive. The publication comes into our hands too
late to be noticed in detail.

[12] _Text-book on Paper-making_, Cross and Bevan (Spon, London: second
edition, 1900). _Chemistry of Paper-making_, Griffin and Little (New
York, 1894: Howard Lockwood & Co.). _Handbuch d. Papierfabrikation_, C.
Hofmann (Berlin). _Paper Trade Review_, London (weekly).
_Papier-Zeitung_, Berlin.

[13] William Mather, M.P., of the firm of Mather & Platt, Limited,
Manchester.

[14] The actual costs varying considerably in the various countries, we
cannot make any specific statement. But from estimates we have made, the
costs of obtaining cotton in filtered solution as collodion multiply its
value by 12-14, the denitrations adding further costs and raising this
multiple to 18-20. In the same estimates we arrived at the conclusion
that the item for raw materials made up 60 p.ct. of the total cost of
the yarn.

[15] The recent failure of a French company founded for the exploitation
of the cuprammonium process may be taken as showing that it presents
very considerable technical difficulties. It is a matter of common
knowledge that this company _estimated_ the costs of production to be
such as to enable the product to be sold at 12 fr. per kilo., whereas
the costs actually obtaining were a large multiple of this figure.

INDEX OF AUTHORS

Bardy, C. H., 157

Bokorny, T., 43

Bronnert, E., 54

Bumcke, G., and Wolffenstein, R., 67

Buntrock, 25

Cross, C. F., 139, 152, 155

Cross, C. F., and Bevan, E. J., 92

Cross, C. F., Bevan, E. J., and Briggs, J. F., 118

Cross, C. F., Bevan, E. J., and Heiberg, T., 114

Cross, C. F., Bevan, E. J., and Smith, C., 101, 103, 105, 114, 145

De Haas, R. W. T., and Tollens, B., 151

Faber, O. v., and Tollens, B., 71

Feilitzen, H. v., and Tollens, B., 154

Fenton, H. J. H., 8

Fenton, H. J.