Section of a White Pine Board sixteen feet long, without wane or sap. 

 nearly free from knots. Annual riims at stump showed tree to have 

 been seventy -five years old. Tioga County, Pennsylvania. 



Section of a joist two and a half inches thick and fourteen inches wide, 

 cut from Old-Field Pine, showing marked difference between spring and 

 summer wood. Southern Virginia. 



Section of Red Oak, four by four inches, 

 showing medullary rays and annual rings. 



Section of Carolina Poplar six years old. 

 Annual rings indicated l>y figures: inter- 

 mediate rings caused by alternate wet 

 and dry weather. Note how irregularly 

 heartwood IK shaped. Keynoldsville, Jef- 

 ferson County, Pennsylvania. 



Section of White Ash sixty-eight years old: roots on side 

 of least growth were deprived of air and moisture by 

 watertight brick pavement. State Capitol ('.rounds. Ilar- 

 risburg. Pennsylvania. Courtesy o/ fennsvltama De- 

 partment of forestry- 



