238 MICHIGAN ACADEMY OF SCIENCE. 



Beecli trees have very light-colored bark and hold a portion of their 

 thin dead leaves. 



The bark on the trunk or large branches of a black, cherry is dark and 

 runs transversely or in scrolls. 



The bark of the trunk and large limbs of sugar maple and black 

 maple, are alike, not verj- rough, abounding in lichens that are nearly 

 white, extending transversely about the trunk. The flower buds are 

 small. 



The lower or outer branches of silver maple are long and drooping 

 with the tips curving outward; flower buds large. 



Red maple grows slower than either of the other two maples named; 

 flower buds large. 



Swamp white oak has a ragged, unkempt top peeling off in thin scrolls; 

 old trunks covered with deep sharp-edged ridges of bark. 



Bur oak has corky ridges on the young branches. 



Pin oak bears large numbers of small branches extending nearh' at 

 right angles to the trunk. 



The trunks of most white oaks are covered by light-colored flaky bark 

 in narrow vertical ridges. There are several other types of white oak 

 bark, among them one having thin strips attached at one edge, and the 

 strips may be a foot long, three inches wide, less than a quarter of an 

 inch thick and extend one edge from the tree at an angle of ten degrees 

 to thirty degrees. 



Beech bark is smooth, the outer twigs very numerous and slender, buds 

 narrow and long. 



Kentucky Coffee tree is not common; the limbs are few and the small- 

 est of them are of unusual size; the bark is wavy with one edge of the 

 flakes curling at an angle of five to thirty degrees. 



Pepperidge or Tupelo when grown with the top well exposed has numer- 

 ous small branches extending nearly at right angles from a short main 

 axis. 



The Cottonwood grows rapidly and the upper straight thrifty branches 

 are greenish white and diverge at an angle of thirty to forty degrees. 

 The older bark is in stout irregular vertical ridges, v-shaped in section, 

 much like that of the tulip tree. 



The large-toothed aspen has a greenish white trunk nearly smooth 

 till eight inches in diameter; upper branches rather large, tortuose; tlie 

 top of the tree rounded. 



The aspen has the branches of the previous summer slender, brown, 

 often drooping; trunk like that of the large-toothed aspen. 



