G ENERALLY speaking, the decline in quality of paper can be attributed to the following factors: (i) increasing use of paper, which has lowered standards; (2) the fact that the public is not educated to demand better-grade paper; (3) production of paper by machine; and (4) low prices, which necessitate the use of cheaper materials. Basically, however, the reasons for this decline are: (i) damage to the fibers in the process of machine work; (2) use of minerals, especially the filler; (3) excessive bleaching, particularly by means of calcium hypochlorite; (4) use of alum; and (5) discovery of mechanical wood pulp by Friedrich Gottlob Keller in I845. In the period of transition from handmade to machine-made paper, the problem of upholding the high standards for papermaking arose. The resultant loss of quality in the properties of paper, especially that used in newspapers, called for a united effort on the part of those concerned over this decline. This effort may be traced from the beginnings made by Ernst Hartig and Fritz Hoyer in i88I and the foundation in I884 of a division for paper-testing in the present-day Materialpruifungsamt (Institute for the Testing of Materials), BerlinDahlem, to the year I886, when Martens succeeded in establishing the first standards for printing-paper. These standards led to the extended science of paper-making as recorded in the work of Wilhelm Herzberg, Papierpriifung. The question of paper-testing was studied by Delisle in France, Franz Ehrle in Italy, the Library Association' and H. M. Stationery Office in England, the Committee on the Deterioration of Paper in the Department of Agriculture in the United States, and, finally, it