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PLATES. No. page Plate 1— Fig. I. Cross-section of Tawa .. .. .. .. .. .. .. .. .. 65 Fig. 11. Cross-section of Insignis Pino .. .. .. .. .. .. .. .. 65 Fig. 111. Cross-section of Rimu .. .. .. .. .. .. .. .. .. 65 Plate 2— Fig. I. Cross-section of Corsican Pine .. .. .. .. .. .. .. .. 66 Fig. 11. Cross-section of Austrian Pino .. .. .. .. .. .. .. .. 66 Fig. 111. Cross-section of Kuropean Larch .. .. .. .. .. .. .. ..66 Plato 3 — Madison Experimental Wood-pulp Grinder .. .. .. .. .. .. 67 Plate 4—• Carbon-papor Impressions of Grinder Stone Surfaces .. .. .. .. .. 68 Plate 5— Fig. I. Groundwood-pulp, Classification Standard No. 1 .. .. .. .. .. .. 69 Fig. 11. Groundwood-pulp, Classification Standard No. 2 .. .. .. .. .. .. 69 Fig. 111. Groundwood-pulp, Classification Standard No. 3 .. .. .. .. .. .. 69 Fig. IV. Groundwood-pulp, Classification Standard No. 4 .. .. .. .. .. .. 69 Plato 6— Fig. I. Whito-spnice Groundwood, Grinder-run No. 5 .. .. .. .. .. .. 70 Fig. 11. Insignis-pine Groundwood, Grinder-run No. 8 .. .. .. .. .. .. 70 Fig. 111. Tawa Groundwood, Grinder-run No. 10 .. .. .. .. .. .. 70 Fig. IV. Tawa Groundwood, Grinder-run No. 15 .. .. .. .. .. .. ..70 Fig. V. Commercial Tawa Groundwood produced at Ladysmith, Wis. .. . . .. .. 70 Plato 7 — Typical Temperature and Pressure Schedules used in Laboratory Sulphite Pulping. (Figs. I-IV) .. 71 Plate 8— Typical Temperature and Pressure Schedules used in Laboratory Sulphite Pulping. (Figs. V-VIII) 72 Plate 9 — Temperature and Pressure Curves used for Commercial Pulping Tests at Ladysmith, Wis. .. 73 Plate 10— Fig. I. Rimu Sulphite Fibres .. .. .. .. .. .. .. .. 74 Fig. 11. Tawa Sulphite Fibres .. .. .. .. .. .. .. .. .. 74 Fig. 111. European-larch Sulphite Fibres .. .. .. .. .. .. .. 74 Fig. IV. Insignis-pine Sulphate Fibres .. .. .. .. .. .. .. .. 74 Fig. V. Austrian-pino Sulphate Fibres .. .. .. .. .. .. .. 74 Fig. VI. Corsican-pine Sulphate Fibres .. .. .. .. .. .. .. 74 Plate 11 — Laboratory Sulphite Digester .. .. .. .. .. .. .. ..75 Plate 12— Laboratory Beater .. .. .. .. .. .. .. .. 76 Plate 1.3 — Laboratory Somi-commercial Rod Mill .. .. .. .. .. .. 77 Plate 14— Laboratory Paper-machine .. .. .. .. .. .. .. .. 78

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