102 



difficult to determine specimens. It is, as the next, an introduced 

 species, but growing in a few places only in the county. 



SALIX ALBA, L. (WHITE WILLOW.) This is by far the most abun- 

 dant of the introduced Willows, as it is also the largest. It has 

 been so extensively propagated by cuttings, that for miles one may 

 search and find among hundreds of trees, only the male form. They 

 are cut frequently, and are of exceedingly rapid growth. Three trees 

 on the land of Mr. Aug. Fowler, of Danvers, measured by Mr. Sears, 

 were as follows, 



(1). Circumference 18 feet 10 inches, 1 foot from ground. 



" 13 " 3 " 6 feet " " 



Spread 90 feet. Height 35 feet. 



(2) Circumference 15 feet inches, 1 foot from ground. 



" 12 " 10 " 6 feet " " 



(3) " 14 " 3 " Ifoot " " 

 15 " 3 " 4 feet " " 

 a 16 10 <. 6 < 



A tree in Wenham by the saw-mill of Mr. John Dodge, planted in 

 1786, was measured in 1873, as follows, 



Circumference 18 feet 10 inches, 1 foot from ground. 

 " 17 " 3 " 5 feet " " 



When growing naturally this species forms a fine tree, a noticeable 

 specimen being the one on the Salem and Boston turnpike, near the 

 Swampscott road. 



SALIX BABYLONICA, Tourn. (WEEPING WILLOW.) Extensively 

 planted as an ornamental tree. Only the fertile plant has been in- 

 troduced, as it is stated the male plant is not so drooping, hence less 

 graceful. 



Salix myrtilloides, L. A very small shrub, growing in bogs at 

 Dauvers, J. H. Sears, Boxford, Hamilton, Essex, Topsfield. Oakes. 

 Rather rare. 



Emerson does not mention this or the first species in his "Trees and 

 Shrubs of Massachusetts," and in the second edition omits S. viminalis 

 and S. purpurea. 



Populus tremuloides, Michx. (AMERICAN ASPEN.) Very 

 abundant in Wenham, Hamilton, Topsfleld, Danvers, Lynnfield, etc., 

 but somewhat less so in the other parts of the county. It seldom 

 attains any great size. 



Populus grandidentata, Michx. (LARGE-TOOTHED ASPEN.) In 

 similar situations to the last, but of larger growth. The largest tree 

 of this species noticed here, is on one of the islands in Wenham 

 Swamp, which measured by Mr. Sears and the writer, in 1875, was, 

 Circumference 7 feet 10 inches at the ground. 



" 5 " at 5 feet above. 



Height about 70 feet. 



