C—3A

69

PLATE 5. Groundwood Pulps, x 15.

Fig. IV.—Groundwood Pulp. Grinder-run No. 15. Classification standard No. 4. U.S. Department of Agriculture Bulletin No. 343.

Fig. III.—Groundwood Pulp. Grinder-run No. 32. Classification standard No. 3.

Fig. II.—Groundwood Pulp. Grinder- run No. 4. Classification standard No. 2.

Fig. I.—Groundwood Pulp. Grinder- run No. 9-1w. Classification standard No. 1.