I02 REVIEWS 



Geology of the City of New York. By I.. P. Graiacap, A.M. 3d 

 ed. , Pp. 232, with 65 figures and 4 maps. New York: Henry 

 Holt & Co., 1909. 



The third edition of this work is much enlarged compared with the 

 second, partly through additions of further geological studies of Manhattan 

 Island by various investigators and also by an extension of the geology of 

 Brooklyn and Long Island. It is perhaps because of the fact that this is a 

 revision of an older volume that many antiquated views remain in the text. 

 As an instance, one is struck in reading the introduction by the classification 

 of the Quaternary (p. 8), where it is stated that "the Ice Age has been 

 divided by some geologists (Chamberlin, Salisbury, Leverett) into two 

 epochs — an early and later Ice Age — between which a reforestration of 

 areas made bare and desolate by the ice took place." Such views were 

 indeed held by these geologists twenty years ago, but they long ago recog- 

 nized their inadequacy and the more complex nature of the Glacial series 

 was described by Chamberlin in the resume of American Glacial history 

 which appeared in James Geikie's Ice Age, in 1895 and has been commonly 

 given in more recent works. 



The book describes the rocks of Manhattan Island, such as the gneiss 

 proper, granite, mica schist, hornblende rocks, and limestones, gives their 

 local occurrence and discusses certain problems connected with their origin, 

 metamorphism, etc. There is a list and description of the minerals of 

 Manhattan Island. These are followed by chapters on the Boroughs of 

 Brooklyn, Bronx, and Richmond (Staten Island). The book closes with 

 a chapter on "Evidences of Glaciation in and about Greater New York. 

 The language of the opening pages of this chapter has been taken, as the 

 author remarks in a footnote, from a former paper by himself which 

 appeared in the Popular Science Monthly in 1878, and might well have 

 been replaced by fresher matter. The book contains much of local his- 

 torical and geographical interest. R. T. C. 



Bulletin of the Scientific Laboratories of Denison University, Vol. 

 XIV, Articles 6-10, pp. 61-188. Granville, O., April, 1909. 



This University Bulletin contains the following articles of geologic 

 interest : 



6. Fossils from the Silurian Formations of Tennessee, Indiana, and 

 Kentucky, by Aug. F. Foerste. 



8. A Stratigraphic Study of Mary Ann Township, Licking County, 

 Ohio, by Frank Carney. 



