UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 607 
Contribution from the Forest Service 
HENRY S. GRAVES, Forester 
Washington, D. C. 
PROFESSIONAL PAPER 
June 7, 1918 
TESTS OF THE ABSORPTION AND PENETRATION 
OF COAL TAR AND CREOSOTE IN 
LONGLEAF PINE 
By 
CLYDE H. TEESDALE, in charge, Section of Wood Preservation, and 
J. D. MacLEAN, Assistant Engineer in Forest Products 
Forest Products Laboratory, Madison, Wis. 
CONTENTS 
Page 
Introduction 1 
Materials Used 2 
Effect on Penetration of Differences in 
the Preservative 5 
Page 
Tests of the Effect of Varying Time, Pres- 
sure, and Temperature 12 
Summary 21 
Appendix 23 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1918 
