ZACATON AS A PAPER-MAKING MATEEIAL. 



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 claimiBg 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 in 

 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 



