Issued June 11, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



FOREST SERVICE. 



HENRY S. GRAVES, Forester. 



FOREST PRODUCTS LABORATORY SERIES. 



EXPERIMENTS WITH 



JACK PINE AND HEMLOCK FOR 



MECHANICAL PULP. 



BY 



J. H. THICKENS, 



Chemical Engineer in Forest Products. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1912. 



