Since the issue of the second edition of this Catalogue the 

 numbei" of works in the Department has been nearly 

 doubled. This part of the Natural History Library con- 

 tains now 5309 works, represented by 8586 volumes. 

 Beside the main titles of these works, 823 cross-references 

 have been inserted in the present edition. 



Care having been taken to collect in the first instance 

 those works which are most frequently required for the 

 arrangement and study of the collections, the Departmental 

 Library, combined with the General Library, fairly fulfils 

 its primary object. But it is still far from being complete, 

 and, as many of the works which are out of print, are very 

 scarce, some difficulty is experienced in obtaining suitable 

 copies. It is hoped, however, that in the course of two or 

 three years, the library will have sufficiently advanced 

 towards completeness to allow of the Alphabetical List, 

 which is the most convenient during the progress of the 

 formation of a Library, being superseded by a systemati- 

 cally-arranged Catalogue. 



This third edition has been prepared by Mr. J, E. 

 Harting, F.L.S. 



ALBERT GtiNTHEE. 



Department of Zoology, 

 March 17, 1884. 



