420 Canadian Record of Science. 



east as Little Metis on the Lower St. Lawrence, where he 

 has plants ten feet high. One of my original Negundos 

 still exists in the College grounds, and I hope will be 

 spared to become an old tree. Dr. Harrington has ascer- 

 tained, from specimens on McGrill College grounds, the pro- 

 portion of sugar yielded by this tree, as compared with the 

 sugar maple, which is so considerable as to warrant its 

 culture as a producer of sugar. 1 



26. The White Ash. Fraxinus americana. 



A great number of trees of this species were raised from 

 tbe seed, and have been planted in various parts of the 

 grounds. The belt of trees on the east side of the Medical 

 building consists of this species, and presents a fine mass of 

 foliage in summer, through the trees are still young. The 

 ash suffers in some years from the attacks of the tent 

 caterpillars (Clisiocampa) , and is rather straggling and 

 slender in its habit of growth, but it is easily cultivated and 

 is a rapid grower, especially in moist ground. 



2*1. The English Ash. Fraxinus excelsior. 



A few specimens of this species were presented by Mr. 

 Young. One still survives in front of the east wing, but is 

 in danger of death from being embanked in earth. It grows 

 vigorously and stands the climate well, but puts forth its 

 leaves very late in spring, so that a casual observer, seeing 

 it bare after other trees are in leaf, would suppose it' dead. 

 It is a finer and more stately tree than any of our species, 

 and deserves cultivation. 



28. The Mountain Ash Pyrus Americana and P. aucuparia. 



The first named species is the native mountain ash and 

 the second is the European species. Both are handsome 

 small trees and produce beautiful pinnate leaves and rich 

 clusters of scarlet berries in autumn The American spe- 



1 Trans. Royal Society of Canada, vol. v. 1888. p. 9. 



