38 OHIO EXPERIMENT STATION: MONTHLY BULLETIN 



pean sycamore, a large, spreading species somewhat similar to 

 its American prototype but in most regards a finer, more desirable 

 tree. The foliage of the plane is quite free from the fungous dis- 

 eases that disfigure the American tree, while its head is much more 

 adequately supplied with limbs and branches. The Norway maple 

 is another good smoke and gas resister whose merits appear now to 

 be pretty generally recognized. Remarkably free from the ravages 

 of pernicious insects, the foliage of the Norway persists long after 

 the branches of most trees are bare. China has contributed the 

 Ginkgo, a unique tree whose leafage endures city conditions but as 

 yet the Ginkgo has not been extensively used in the formation of 

 avenues. 



r 



A group of liquidambar, or sweet gum trees 



Trees for restricted areas. In -many villages and towns the 

 lawns are so restricted in size that space can only be spared for 

 medium to small trees. Under such circumstances the liquidamber 

 or sweet gum, from the South, the yellow-wood, a rare flowering 

 tree, the flowering dogwood or perchance a tree or two of birch will 

 be all that can be accommodated. Birches stand much cold, flourish 

 on poor soils and are extremely artistic. The paper or canoe birch 

 and the European white are two very desirable ones, while the cut- 

 leaved variety of the latter, B. alba pendula laciniata, is .one of the 

 handsomest weeping trees known. The red or river birch has 



