LETTER OF TRANSMITTAL. 



U. S. DEPARTMENT OF AGRICULTURE, 



FOREST SERVICE, 

 Washington, D. C., June 27, 1906. 



SIR: I have the honor to transmit herewith a report entitled 

 " Forest Planting on Coal Lands in Western Pennsylvania," by S. N. 

 Spring, Forest Assistant, Forest Service, and to recommend its publi- 

 cation as Circular 41 of the Forest Service. 

 Very respectfully, 



GlFFORD PlNCHOT, 



Forester. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



CONTENTS. 



Page. 



History of the original forest 5 



Coal mining and its effects 6 



Effect of coke production 8 



Opportunity for forest planting 8 



Insects an obstacle to planting 10 



Injury by a defoliating caterpillar 10 



Insect damage to the locust , 11 



The Frick planting plan 13 



The land 13 



The plan . 14 



General applicability of the Frick plan 15 



(3) 



