TJTILIZATIOIT OF ELM. 



2. Pores of early wood in & single tangential row. 



a. Pores of early wood comparatively large, forming a continuous row; 



bands of small pores numerous, usually about as wide as the inter- 

 vening bands of dense tissue. Wood moderately bard and heavy. 



White Elm, Ulmus americana. 



b. Pores of early wood minute, individual pores scarcely \dsible to the 



unaided eye, often rather widely separated: bands of small pores not 

 so numerous as in white elm, nan'ower than the intervening bands 

 of dense tissue (except in narrow rings). Wood very hard, heavy, 

 dense Cork or Rock Elm, Ulmus racemosa. 



SUPPLY AND DEMAND. 



RANGE AND SIZE OF SPECIES. 



Tlie botanical range of white elm includes nearly all of the region 

 east of the Rocky Mountains (fig. 1). The area of principal com- 



FiG. 1. — Distribution of white elm {Ulmus americana). 



mercial importance, however, is southern New England, the Great 

 Lakes States, and the southern Mississippi VaUey. White elm is 

 the largest of the elms, frequently attaining a height of from 100 

 to 120 feet, with a buttressed trunk from 6 to 10 feet in diameter. 

 The range of sHppery elm (fig. 2) is nearly as great as that of white 

 elm and includes practically the same territory. Shppery elm is not 



