332 



Conclusion. 



The circumstance that the data of this paper are sum- 

 marized in numerical tables must not be permitted to obscure 

 the fact that they merely present a Hxed picture of a fleeting 

 condition; that they are to be taken only as numerical gener- 

 alizations of the observations here recbrded, and do not, in 

 themselves, warrant much by way of inference beyond their 

 immediate contents. The view of the autumnal bird life of cen- 

 tral Illinois which we get by their means is like a short-time 

 photograph of a changing scene — changing so rapidly, indeed. 



