75 



book is as follows: Introduction (pp. 1-37); list of local floras of 

 the Torrey Club range (38-45); catalogue of plants (47-651); 

 index (652-683). From the summary it is learned that the total 

 number of species admitted into the work, excluding waifs, is 

 2,651, and that of these 2,038 are native. A list (p. 32) is given 

 of twenty-two species which appear to be endemic within the 

 area. 



The introduction is largely taken up with a discussion of phyto- 

 geographical problems. The factors which affect the distribution 

 of the local flora are treated under two heads: edaphic and 

 climatic. From a geological standpoint the region presents great 

 diversity, while its floristic diversity is suggested by the fact 

 that 281 species (list, p. 14) reach their northern and 180 species 

 (list, p. 18) their southern limits of range here. For the purpose 

 of the phytogeographer the area is divided into two parts: 

 glaciated and unglaciated. The terminal moraine which sep- 

 arates the two extends through Long and Staten Islands, 

 upper New Jersey, and Pennsylvania. The glaciated region is 

 said to be typified by the large percentage of hardwood trees, 

 the relative numerical scarcity of conifers, and the large number 

 (595) of introduced species. A list (p. 5) is given of 165 native 

 species which occur exclusively north of the moraine. The 

 unglaciated region includes the coastal plain (Tertiary) in 

 southern Long Island and New Jersey and the Piedmont Plateau 

 (Cretaceous) in northern New Jersey and Pennsylvania. Many 

 bog plants found elsewhere seem, so far as New Jersey is con- 

 cerned, to be absent from this latter district (list, p. 4). 



In discussing the coastal plain the author reasserts his con- 

 viction* that the origin and present distribution of the pine- 

 barrens is to be explained on a geological basis. In his opinion 

 this tract is coextensive with the Beacon Hill formation, an area 

 which, according to geological evidence, has been "uninter- 

 ruptedly out of water since upper Miocene times," whereas the 

 adjoining parts of the coastal plain have been subjected to 

 repeated submergence and emergence. The pine-barrens are 

 therefore said to represent an area which has been isolated by 



* See Torreya 12: 229-242. 1912. 



