70 Cincinnati Society of Natural History. 



lets them slip,'' is well sustained b}^ the facts cited, and is of interest 

 in its relations to the question of the development of varieties and 

 species, 



A most important feature of the work is the Bibliographical Appen- 

 dix of two hundred and eighteen pages, comprising the " North Amer- 

 ican section of the Faunal Publication Series," of the Universal Biblio- 

 graphy of Ornithology, upon which the author has been for some 

 years engaged. Here are arranged about fifteen hundred titles (incor- 

 rectly stated by the author as " nearly or about one thousand,") em- 

 bracing " a range of publications from the works of Wilson or Audubon 

 down to the least note on the subject." The period covered ranges 

 from the j^ear 1612 down to the latter part of 1878, with the titles ar- 

 ranged " verbatim, literatim et punctuatim,''' in alphabetical order under 

 each year. The value of this portion of the wurk is further enhanced 

 by two indexes, one of authors, the other of localities, which greatly 

 facilitate reference to the main bibliography, and the work closes with 

 a copious index to the whole volume exclusive of the bil)liographical 

 portion. As the author truly remarks, bibliography is always more or 

 less defective, and it is not surprising that, in a work covering so much 

 irround, a few errors and omissions occur. As regards Ohio ornithology, 

 these are nearly all of minor importance, so far as our observation ex- 

 tends ; a notable omission, however, being that of Dr. Kirtland's origi- 

 nal list of Ohio birds (Ohio Geological Survey, 1838). 



Taken as a whole, the volume deserves the highest commendation, 

 both as a model of bibliographical architecture, and as a most import- 

 ant contribution to ornithological science ; and the publication of the 

 remainder of the work, which we are Informed is nearly completed, 

 will be looked forward to with a peculiar interest. F. W. L. 



