(C) Esparto and straw celluloses.
(D) Mechanical wood-pulp.
In regard, therefore, to papers for books and documents of permanent value, the selection must be taken in this order, and always with due regard to the fulfilment of the conditions of normal treatment above dealt with as common to all papers.
The Committee have been desirous of bringing their investigations to a practical conclusion in specific terms—viz. by the suggestion of standards of quality. It is evident that in the majority of cases there is little fault to find with the practical adjustments which rule the trade. They are, therefore, satisfied to limit their specific findings to the following—viz. (1) normal standard of quality for book-papers required for publications of permanent value. For such papers they specify as follows:
Fibres: Not less than 70 p.ct of fibres of class A; class D excluded.
Sizing: Not more than 2 p.ct. rosin, and finished with the normal acidity of pure alum; starch excluded.
Loading: Not more than 10 p.ct. total mineral matter (ash).
(2) With regard to written documents, it must be evident that the proper materials are those of class A, and that the paper should be pure and sized with gelatin, and not with rosin. All imitations of high-class writing-papers which are, in fact, merely disguised printing-papers, should be carefully avoided.
Appendix.—To the Report is added 'Abstracts of Papers' in 'Mittheilungen aus den Koniglichen Technischen Versuchsanstalten, Berlin,' for the years 1885-1896 inclusive—which is, in fact, a summary of the investigations of the Institution in connection with paper and paper-standards.