TJTILIZATIOlSr OF ELM. 



the three important species. There is yet considerable standing 

 timber of white ehn in these two States, and one of the principal 

 sources of supply is the northern third of the southern peninsula of 

 Michigan. A large part of the total supply of cork elm also comes 

 from the southern parts of Wisconsin and Michigan. This species 

 of elm is being exhausted much more rapidly than the others. 



So much of the forest timber has been removed in the Great Lakes 

 region that factories requiring a large supply of cheap elm timber 

 have in many cases been forcsd to discontinue operations there. 

 Future supplies in this region must come largely from woodlots and 

 small timber holdings. 



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Fig. 3. — Distribution of cork elm (C/"toMsrace7ftOsa). 



There is considerable standing white elm in the southern Mississippi 

 Valley region, where it has only recently been exploited to any great 

 extent. Arkansas is now one of the principal sources of white-elm 

 timber, but factories in that State which demand large quantities of 

 elm in the log are already complaining that they have considerable 

 trouble in securing a sufficient supply. Many of such factories have 

 removed farther south to Mississippi and Louisiana. These two 

 States have been yielding increasing amounts of elm saw timber 

 each year and must be depended on for a large part of such timber 

 in the future as well as a supply in log form for elm-using factories. 



The elm timber of the southern Mississippi Valley region, in gen- 

 eral, seems to differ in quality from that obtained in the Great 

 50425°— 18— Bull. 683 2 



