ZACATOIST AS A PAPER-MAKING MATERIAL. 
11 
tion of the plant-cellulose fibers, while the second division concerns 
the physical treatment and formation of these fibers into the finished 
sheet. 
The separation and purification of the cellulose fibers is necessarily 
investigated first, and should be brought to as satisfactory a con- 
Fig. 9.— Zacaton grass claiming a formerly cultivated field on a terraced hillside near Quezaltenango, 
Guatemala. 
elusion as possible before actual paper making is considered. This 
investigation is most advantageously, almost necessarily, pursued m 
the laboratory, where conditions can be produced and accurately 
controlled. Fiber separation or production is effected commercially 
by one of the four following processes: The mechanical process, by 
