iSg.l 



StoNf. on the Graphic Rcftreaeiitatio)! of Ih'rd Waves. 



195 



town, Pa. (Witmcr Stone). The numbers indicate the exact 

 number of birds seen; 'F' denotes t^ocks ; 'A,' abundant ; 'C,' 

 common; and 'S,' several. Wherever a record siiows tliat a 

 movement was taking place, either by the arrival of a species not 

 seen on the days preceding or by the marked increase in the 

 number of individuals of a species, the record is surrounded by a 

 hea\y line. The idea is, to show how these records are massed 

 on certain days, indicating a bird wave on that day or the 

 night just preceding, and also how these waves always occur at 

 times when there is a marked rise in temperature. 



In these small cuts, it is only possible to record the observations 

 on a very few species, and I have been able only to show two or 



Chart sho-i.ving the Second and Third Waves of iSgo. 



