REVIEWS 431 



chemistry of pulp and paper making. Taken together with Witham's 

 "Modern Pulp and Paper Making," it constitutes a most excellent 

 source of authoritative information for all interested in this highly 

 important forest product. Hitherto Cross and Bevan, and Clapperton, 

 and other British authors commanded the field. Now the need for an 

 American book, dealing with the American aspects of the pulp and 

 paper industry, has been met. There remain to appear the series of 

 technical textbooks which are being issued jointly by the Canadian 

 Pulp and Paper Association and the American Paper and Pulp Asso- 

 ciation to make the tale complete. 



■ Sutermeister presupposes that his readers have a fair knowledge 

 of the elements of chemistry, but the book has been written so simply 

 that any one connected with the pulp and paper industry can readily 

 understand it. 



The book divides into sixteen chapters and an appendix. The first 

 chapter is a discussion of cellulose and is based on a careful review of 

 the literature relating to the subject. Chapters 2 and 3 deal with the 

 fibrous raw materials (especially wood) and with rags, esparto, straw, 

 and bamboo. Strangely enough, the drawings of various wood ele- 

 ments (figs. 1,2, and 3) are all based on non- American woods. Similar 

 drawings might easily have been obtained for our native pulpwoods 

 and would have been of far greater value. On the other hand, the 

 photomicrographs, prepared by the Paper Section of the U. S. Bureau 

 of Standards, are all of material used in America and, for the woods, 

 include red spruce, white spruce, balsam fir, jack pine, hemlock, Doug- 

 las fir, aspen, yellow birch, beech, chestnut, tulip-tree, sweet gum, hard 

 maple, silver maple, and black gum (plates 12-26). The author gives 

 the range, qualities, and uses (for pulp) of these species. For jack 

 pine he says: "It is not suitable for use in the sulphite process" (p. 

 59). Nevertheless, the Laurentide Co. (1920) used it up to 20 per 

 cent with spruce in making newsprint ! 



Chapters 4, 5, 6, and 7 deal, respectively, with the soda process, the 

 sulphate process, the sulphite process, and the mechanical process of 

 making pulp, the last three named being confined to wood as a raw 

 material. Each process is described concisely as to methods used and 

 yields obtained. 



Chapters 8, 9, 10, and 11 deal, respectively, with bleaching, sizing, 

 loading and filling, and coloring. 



