PREFATORY NOTE. 
This report is based primarily on experiments conducted by the 
author, Mr. F. W. Kressmann, at the Forest Products Laboratory, 
prior to December, 1916. The information thus obtained has been 
supplemented by the results obtained in succeeding years by 
Mr. Kressmann while in private employment as manager succes- 
sively of the Standard Lessee Corporation and the International 
Alcohol Corporation and as director of the development depart- 
ment of the latter corporation. Acknowledgments are due these 
companies for their consent to the utilization of information obtained 
by Mr. Kressmann in connection with his work for them and to 
Mr. Kressmann himself for his assistance in the completion of the 
investigation and report. 
William B. Greeley, 
Forester. 
FOREST SERVICE. 
WILLIAM B. GREELEY, Forester. 
EDWARD A. SHERMAN, Associate Forester. 
BRANCH OF RESEARCH. 
Eaele H. Clapp, Assistant Forester in charge. 
Forest Products Laboratory. 
Carltle P. Winslow, Director. 
Ovid M. .Butler, Assistant Director. 
SECTION OF DERIVED PRODUCTS. 
L. F. Hawley, in charge. 
F. W. Kressmann, formerly chemist in Forest Products. 
