MAY >' - m 



Issued May 7, 1913. 



U. S. DEPARTMENT OF AGRICULTURE, 

 FOREST SERVICE — CIRCULAR 215. 



HENRY S. GRAVES, Forester. 



PITH-RAY FLECKS IN WOOD. 



BY 



H. P. BROWN, 



Xylotomist. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1913. 



