16 Trans. Acad. Sci. of St. Louis 



the neutral tint of night allows the safe retreat. On Sep- 

 tember 7 and 8 the number of Martins present was still 

 as large, or larger, than ever. After the sultry, stormy 

 weather of September 9 and 10 a cold northwest wind 

 reduced the temperature to 66 degrees on the 11th, and 

 on this evening the Martins assembled on the sandbar 

 for the last time. The number was much smaller than 

 usual, and when the cloud rose from the bank at 6 P. M. 

 comparatively few returned. On the 12th no Martin was 

 sitting on the bar, but about a hundred flocked together 

 low above the water near the bar and disappeared soon, 

 moving slowly in a southerly direction. The same took 

 place on all the following days. Small flocks began to 

 collect at 5:30 and disappeared after staying about the 

 neighborhood until a little after 6 P. M. The last were 

 seen on the 18th, but only a few, and none today. 



