POND SURROUNDINGS 1 93 



Other hardy spruces which make a pleas- 

 ing appearance, are P. pungens and P. alba. 

 The latter endures heat and drought very well, 

 differing in this respect from the Sitka spruce 

 (P. Sitchensis), and which, though very orna- 

 mental, cannot be recommended on this 

 account. 



Another evergreen, well adapted for a wind- 

 break, because of its density and symmetry, 

 is the arborvitae (Thuya occidentalis), though 

 in beauty and rapidity of growth it is surpassed 

 by the Thuya gigantea. This is not quite 

 hardy in the East, though able to stand the 

 winter on the Atlantic Coast as far north as 

 43° lat., in which it agrees with the Siberian 

 arborvitse {Thuya orientalis) . T. orientalis 

 and T. occidentalis are readily distinguished 

 by the position of the branchlets; in the 

 former they are arranged perpendicularly, but 

 less so in T- occidentalis. The latter tree 

 may become sixty feet high; the former never 

 attains a height of more than twenty-five 

 feet. 



Though well adapted for planting singly in 



