12 



Wild Birds. 



EXPERIMENTS IN THE USE OF THE OBSERVATION TENT AND IN CHANGE OF NESTING 



SITE. 



In only three cases where the nest with its supports was moved did the young suffer, 

 and in each of these from unusual conditions. A nest of Cedar Waxwings (8) though fed 

 by both birds and brooded almost constantly, succumbed to the heat, the day being one 

 of the hardest of the entire summer. The second, a nest of Bluebirds (15), were constantly 

 fed during the day while I watched them, but the old birds were frightened off at some 

 later time, and their young left to perish. The third, a nest of Song Sparrows (25), also 

 came to grief on account of the heat. The day was the hottest ever recorded by the 

 Weather Bureau in New England, and the nest, which was moved to the open, hap- 

 pened to be in the crotch of a dead sapling, so that the birds were exposed on all sides. 



