DESCRIPTION OF TREES. 141 



WHITE HICKORY OR SIIAGBARK (Carya alba). On very 

 heavy soils this tree may become a very good street-tree, but 

 on light land it would be of no value. Its habit of growth 

 is tall and upright, with bright green foliage, and is 

 generally free from insect or fungous attack. It is even 

 more difficult to transplant than the oak or chestnut, but 

 it may be started from seed where it is to grow or be pre- 

 pared for transplanting in the nursery or fields, as is the 

 oak or chestnut. 



BLACK WALNUT (Juglans nigra). No grander tree can 

 be found among those native of the United States than the 

 black walnut as occasionally seen in the Eastern States and 

 very frequently in the West, but it is not often seen planted 

 in avenues. It is difficult to transplant and requires a 

 rather heary soil for its best growth, but if properly treated, 

 i.e., like the oak and chestnut, will make very beautiful 

 street-trees. It is rather slow in growth, and requires a 

 little care to prevent the formation of low-forked main 

 branches. 



TULIP- TREE (Liriodendron tulipifera). This is one of 

 our most beautiful trees, and if it could be more easily 

 transplanted would be more largely used as a street- or 

 avenue-tree than it now is. The fibrous roots of this tree 

 are very succulent and easily injured by extreme pressure 

 or by exposure to drying winds or sun, and the greatest 

 care must be exercised in transplanting it. If transplanted 

 frequently in the nursery, it may be safely moved until it 

 reaches the growth of 3 or 4 inches in diameter; otherwise 

 only young trees should be used, and more careful protec- 

 tion be given them against injury than would be required 

 for larger trees of other species. 



Many other species of trees might be used for street or 



