18 Bird Migration in the Mississippi Valley. 



next few days were so cold, cloudy and disagreeable that the departure of the 

 transients still remaining was slow and hardly noticeable. 



May 20-May 23. These days were cloudy and rainy with wind shifting from 

 west to north and northeast, and the mercury hanging around 40 dgs., with a 

 fall, twice, to 32 dgs. 



May 24. After a hard rain the night before, we again had Spring weather 

 and a bright, clear day. It showed the last arrival of the season of the Sum- 

 mer sojourners, the cuckoos, which usually bring up very near the end of 

 the list; and it also showed the tawny and olive-backed thrushes as 

 numerous as any time this Spring. 



But little remains to be chronicled of this Spring's migration. The last 

 transient visitors, the Connecticut and the Canadian fly-catching warblers, 

 put in their appearance on the 26th ; after a four days' visit, left us on the 

 29th, taking with them nearly all the remaining transients; and when the 

 last olive-back departed on the last day of May, migration was ended. 



