12 



BULLETIN 205. 



LINDEN. 



The linden requires an abundance of deep rich soil and suffers much from 

 gas, from drought, and from insect attacks. It does fairly well in Wash- 

 ington, but is little planted now because of the extra care it requires as 

 regards soil and water. In Berlin, Frankfurt, Hamburg, and Paris, the 

 leaves of most varieties of linden fall prematurely on account of insect and 

 fungus attacks. In Philadelphia a few years ago all the large lindens were 

 killed by borers. A further objection to this tree is the litter made by its 

 blossoms and fruit. 



TULIP-TREE. 



The tulip-tree is too large except for the widest avenues and park borders, 

 where there is a quantity of rich deep soil and abundance of room. It is 

 likewise difficult to transplant, the branches are very brittle, and the leaves 

 are continually dropping throughout the season. It is, however, prac- 

 tically free from enemies. 



BLACK LOCUST. 



The black locust is a rapid grower, hardy, easily propagated and trans- 

 planted, and does well in poor soil. 

 It is successfully cultivated in 

 Paris, where the top is kept small 

 and spherical and the branches 

 thickly clustered. Its hard and 

 durable wood is beginning to be 

 used in Paris for paving the streets. 

 On the other hand, the tree is 

 scraggly and angular in form, its 

 branches brittle, its foliage short- 

 lived, its pods unsightly, and its 

 roots badly given to sprouting. 

 The locust borer often kills the 

 black locust, as well as the honey 

 locust, and has been known to 



FIG. 17. Black locusts near Pere 

 Le Chaise, Paris. 



spread from these trees to certain species of oaks. 



WILLOW. 



The weeping willow is the only 

 species used on streets, and its 

 occurrence is rare. It grows 

 rapidly and when perfect makes a 

 fine appearance, but the wood is 

 tender and is often attacked by 

 fungi, while the tussock moth and 

 other leaf-eating insects frequently 

 destroy its foliage. The white 

 willow is excellent for windbreaks 

 and for planting along the banks 

 of streams, railroads, and other 

 embankments. Fine rows of this 



FIG. 18. Old while willows along 

 Cascadilla Creek, Ithaca, planted 

 to preserve the banks of the stream. 



