Bui. 80, U. S. Dept. of Agriculture. 



Plate II. 







Fibers of an Over-Cooked Pulp Produced with a Large Amount of Caustic 

 Soda. (Cook 4.) Magnified 65 Diameters. 



Partial disintegration has taken place. The fibers are fragmentary and contorted with rather 

 weak cell walls. The vessels with barely visible markings are on the point of being 

 eliminated. 



