FOREST TREES. 225 
plants that have been rendered compact by clipping, 
retain the fresh green of their leaves in winter better 
than those with more open foliage. It is somewhat 
prone to send up two or more leaders, but only one 
should be permitted to grow if a symmetrical tree is 
desired. For an ornamental hedge or low screen, the 
plants may be set fifteen or eighteen inches apart ina 
single row. For a screen designed for protection, 
two or more rows should be planted six feet apart, 
in the rows, and so placed as to be opposite the spaces 
in the next row. When designed for timber they 
must be planted thickly like other trees. Although 
growing mostly in swamps, the Arbor Vite thrives 
upon the Western prairies; indeed, it will do so in 
most soils except stiff clays. It roots readily from 
layers and cuttings. 
In propagation by secd, the Arbor Vite shows a 
considerable tendency to the production of varieties. 
In the grounds of Robert Douglas, of Waukegan, Illi- 
nois, I saw many plants which he had selected from his 
seed beds; some of which gave promise of becoming 
desirable acquisitions. Some of these had their leaves 
tipped with silvery white; others had the hue of the 
Golden Arbor Vita, while some appeared nearly iden- , 
tical with the Siberian. Dwarf varieties arc sometimes 
found among plants brought from the forest. There 
are several named varieties in cultivation, of which 
only three will be noticed here. 
Var. Siberica (Siberian Arbor Vite) is of much 
slower growth than the species; its form is more com- 
pact, and its foliage more dense. It retains the dark 
