90 The Wilson Bulletin— No. 112 



settled earlier, the time at whioli the birds first called was 

 advanced somewhat. 



Professor Frank Smith of the University of Illinois 

 who was present at the Station also became interested in 

 the calls of this bird and iu his experience the birds called 

 more continuously in the early morning. On July 1 he 

 counted 369 calls with but exceedingly brief intervals, so 

 that for all practical purposes the calls nun^ be considered 

 as consecutive. 



July 3, 9:00 I'. M. The birds began to call shortly 

 before this liour and the particular individual recorded 

 here had given five or six calls before counting was be- 

 gun. Our results on tliis bird were as follows: 57 calls; 

 interval of about 10 seconds; 123 calls; interval very brief; 

 112 calls. Total, 294 calls with scarcely an interruption. 



July 5, 9 :00 I*. M. 39(1 calls with but 3 intervals, the 

 first two of which were of not more than 2 seconds each in 

 duration wliile the third interval was of about 5 seconds' 

 duration. 



July 6, 9:00 V. M. 51 calls; interval; 167 calls; inter- 

 val; 26 calls; interval; 10 calls; interval; 72 calls. Total, 

 326 calls with three intervals. No interval was of more 

 than 5 seconds' duration. Counting was discontinued after 

 an interval of more than 5 minutes. (Count by Mrs. 

 Stoner) . 



July 12, 5:00 A. M. 51 calls; interval brief; 462 calls 

 without the slightest intermission ; interval brief ; 47 calls ; 

 interval brief; 24 calls; interval brief; 126 calls. Total, 

 710 calls with 4 intervals of vaiwing lengtlis but none of 

 more tlian a few moments duration. The count was made 

 by I'rofessor Smitli while the bird was perched on the top 

 of his tent. 



July 25, 8:15 1'. M.,The calls of the whippoorwill are 

 now becoming fewer, and less ])rolonged and are more ir- 

 regularly given than those observed during the latter part 

 of June and the first half of July. In addition, the inter- 

 vals betAvoen calls are proportionately longer. Tlie birds 



