46 
Annual Reports of Academy of 
With the development of the research collection it must not be 
thought that the exhibition collections are neglected. Many 
freshly-mounted specimens have been presented and others pre¬ 
pared in our taxidermical shop to replenish the exhibits. 
A nearly complete local collection is now displayed, mainly 
through the cooperation of the Delaware Valley Ornithological 
Club; and a seasonal exhibit is arranged to show the sequence of 
arrival of migrants in Spring, both of which are constantly con¬ 
sulted by local bird students. As an adjunct to these a local 
collection of skins of Pennsylvania and New Jersey birds is kept 
separate from the main series for the use of more advanced local stu¬ 
dents. 
Future aims are to arrange the exhibits into faunal and sys¬ 
tematic series, and to add groups illustrating life histories, and 
special phases of bird life, as fast as means are available. 
It should thus be clear that two lines of activity are being 
constantly maintained. (i) The preservation of our historic, 
scientific, research collection, with the idea of making it as nearly 
complete as possible and to further technical ornithological study. 
(2) The maintenance of exhibition collections which shall be as 
instructive as possible, and yet not involve the deterioration of 
specimens whose scientific value demands their most careful 
preservation. 
