AEEANGEMENT OF SPECllMENS. 649 



blank becomes a sort of challenge, calling upon the collector to 

 fill it vip. Thus, a perpetual interest is taken in the collection, 

 and the proprietor regards it with increasing pride, as year by 

 year the blanks become filled up, and their places ax'e taken by 

 row upon row of well-set insects. 



