1907.] NATURAL SCIENCES OF PHILADELPHIA. 453 



While I contemplate a much fullor and more exhaustive treatment 

 of the subject in the future, it seems desirable to present at once some 

 of the conclusions to which my studies have led. It would seem that 

 those portions of eastern Pennsylvania and New Jersey that we have 

 been accustomed to refer to the Carolinian zone are divisible into 

 several areas running in a general northeast and southwest line parallel 

 to the mountains: 



I. A hilly or rolling country adjoining the Alleghanian on the west 

 and north and reaching east and south to the flat bottom of the lower 

 Delaware Valley and the old Raritan basin. 



II. The Delaware Valley -West Jersey region.' 



III. The Pine Barrens. 



1\'. The Atlantic Coast strip, including the higher parts of the 

 coast islands. 



V. The Maritime meadows and sea beach. 



It is with the three middle divisions that this paper has to deal — the 

 Pine Barrens, the Delaware \'alley and Coast Strip. 



The greater part of southern New Jersey is composed of what is 

 known as the Pine Barren region, covering according to current views 

 all the country east and south of a line from Long Branch to Bridgeton. 



The flora of the Pine Barrens is very uniform with relatively few 

 species, but generally so difTerent from that of the area to the west 

 that the passage from one to the other is easily noticeable even from a 

 moving railway train. Indeed I am not acquainted with any transi- 

 tion so striking elsewhere in the Middle States. The West Jersey 

 flora is identical with that of the low grounds on the Pennsylvania side 

 of the Delaware at Tinicum, Bristol, TuUytown, and doubtless also of 

 the lower part of Philadelphia when that was in a state of nature. 

 This same flora extends northeastward across New Jersey above the 

 Pine Barrens and south of the hilly region to the north. Indeed the 

 reseml)lance between the plant life at Tinicum, Delaware Co., Pa,, 

 and from Monmouth Junction to Princeton Junction, N. J., is remark- 

 able. 



The flora of the New Jersey Pine Barrens has long been familiar to 

 botanists, and the species of the south Atlantic coastal plain which 

 here find their northern limit have for the most part been listed for 



'Plate XII in Sali.sl)ury's Physical Geographij of New Jersey, 1S9S (Vol. IV. 

 Final Rep. of State Geologist), shows a remarkable correspondence witli my 

 floral areas. Tlie area of Pensauken submergence being almost equivalent to 

 mv Delaware Valley and Coast regions, while the elevated Beacon Hill region is 

 the typical Pine Barrens. 



