CHAPTER I I 



THEIR PRESENT-DAY 

 DISTRI BUTION 



MANY persons take it for granted that the 

 types of trees with which they are familiar 

 are found all the world over; others more 

 discerning know that every tree has birt a limited dis- 

 tribution covering at most a limited range of degrees 

 of latitude and longitude. They know that the Oaks, 

 Elms, Maples, Pines, and Firs are different on the 

 east and west seaboards of this country; also that 

 both differ from those of Europe on the one hand and 

 of eastern Asia on the other. If one looks into the 

 subject all sorts of curious facts are unearthed. For 

 instance, the Tulip-tree and the Kentucky Coffee- 

 tree are each represented by two species only, one of 

 each in the eastern United States and another of 

 each in central China. Of Douglas Firs, two species 

 grow on the mountains of the Pacific Slope and two 

 species in eastern Asia. The Honey-locusts grow 

 in eastern North America, in eastern Asia, and in the 

 Caucasus region. One species of Incense Cedar is 

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