— strainers, [148]

Bibliography, [229]

Birch, composition, [61]

—, pulp yield, [77]

Bisulphite, action on cellulose compared with soda, [76]

—, colour of pulp produced by, [77]

— process, advantages, [76]

— processes for wood, [71]

Bleached pulp, freeing from bleach, [114]

— —, improving colour, [114]