84 



THE AMERICAN NATURALIST [Vol. XLI 



A. ACCESSION CATALOGUE. 



In this catalogue, all material ^ received or collected at a partic- 

 ular time from a particular source, (an accession), is placed under 

 a single accession number. Thus the catalogue will contain a 

 record of each group of specimens coming into the possession of 

 the different departments in the museums, and by means of a 

 series of cross references, consisting of tabs arranged as indicated 



accompanymg 



