100 Horticultural Department. [Bulletin 120 



CORK OR ROCK ELM. ( Ulmus racemosa.) 



The Cork elm is muck slower in growth than either the Red or the 

 White elms. Trees ten years old have not made a growth of one foot 

 each year. It is very hardy and of good appearance. The wood is 

 tough and strong. Seeds should be sown as soon as ripe. 



HACKBERRY. ( Celtis occidentalis. ) 



The hackberry has been planted in various soils and locations and 

 invariably proved to be a good tree. The rate of growth is about 

 equal to elm, in rich soil rather more rapid than elm. The wood 

 makes very fair fuel, but is of low value for posts. The trees are 

 readily propagated from seed, sown in fall or stratified in moist sand 

 or soil over winter and planted the following spring. 



PLANE TREE (SYCAMORE). (Platanus occidentalis.) 



This species has been planted at this Station only as an ornamental, 

 and has been uniformly hardy, but of rather slow growth. It usually 

 forms an open, spreading head, making poor shade. Much the best 

 growth has been made in low, rich soil, but even on high ground they 

 have made satisfactory trees. 



Trees twenty-two years old give the following measurements : 



Height 33 ft. 6 in. 



Diameter at base 9 inches. 



" at 5 feet 7 " 



at 10 feet 6 



at 15 feet 4 " 



The sycamore has been propagated from seed sown in the spring 

 and covered. As a rule, but a small per cent, of the seed has ger- 

 minated. 



