64 HOLLICK. 



by him. If found upon the Hst it was checked off, and if not a 

 memorandum was made and specimens collected. 



Physiographically the flora may be divided into that of hills, 

 the peat bogs and pond holes, the salt marshes, the sand dunes 

 and the salt water, the latter being exclusively algal, except for 

 Zostera. The island is practically treeless and hence also de- 

 void of such vegetation as is dependent upon forestal conditions. 

 The bulk of the surface is that of a typical morainal region, 

 Avith rounded hills and corresponding depressions, many of the 

 latter being occupied by swamps or ponds, often without any 

 visible outlet. Running streams are few and insignificant, and 

 permanent springs occur only in a limited number of localities, 

 mostly close to tide -water. Great Salt Pond, now connected 

 with the ocean by means of an artificial channel, but formerly 

 said to have been fresh water, occupies the center of the island 

 and almost divides it into two parts, while between the eastern 

 and western borders of this pond and the ocean are low nar- 

 row strips of dunes and sand beaches. The remainder of the 

 coast line is more or less precipitous and is strewn with boul- 

 ders, washed out from the adjoining land. The soil, except 

 that of the limited dune and sand beach areas, consists of the 

 boulder till and gravel. There are no rock outcrops anywhere 

 exposed, and the geological conditions preclude the probability 

 of any being within hundreds of feet of the surface. Probably 

 all the land capable of it is, or has been at some time, either 

 under cultivation or used for pasturage. Such, in brief, are the 

 conditions under which the vegetation exists to-day on an iso- 

 lated island about eleven square miles in area. 



Additions to the Flora. 



Mr. Bailey enumerates in his list 285 species of Spermato- 

 phyta and 9 Pteridophyta, to which I was able to make the fol- 

 lowing additions, collected between July 8th and July 30th. 



1. Zostera marina L. Abundant in salt water. 



2. Paniciun splicer ocar poll YW. \ «, , . ^.uj u-n^ 



^ . ^ , \ y Abundant on the dry hills. 



3. Famciuji puocsccns Yjd.vi\. J 



Probably included by Mr." Bailey under P. dichotovnwi L. 



