Vol 'i9j8 XV ] Bayliss, The Yellow-billed Cuckoo. 161 



1904. A revision of the American Great Horned Owls. Proc. U. S. 

 Natl. Mus., 27, 177-192. 



RlDGWAY, R. 



1914. The birds of North and Middle America. U. S. Natl. Mus., 

 Bull., 50, part 6, xx + 882 pp., 36 pis. 

 Snodgrass, Robert E. 



1904. A list of land birds from central and southeastern Washington. 

 Auk, 21, 223-233. 



TOWNSEND, J. K. 



1839. Narrative of a journey across the Rocky Mountains to the 

 Columbia River, and a visit to the Sandwich Islands, Chili, 

 etc.; with a scientific appendix. (H. Perkins, Philadelphia), 

 viii (9) 352 pp. 



A STUDY OF THE YELLOW-BILLED CUCKOO. 



BY CLARA KERN BAYLISS. 



On July 24, 1916, I found a Yellow-billed Cuckoo's nest, with 

 the bird incubating, ten feet from the ground on the horizontal 

 branch of a small elm. Not having my "periscope" (an adjust- 

 able mirror at the top of a bamboo pole) with me, I assisted a little 

 girl who had accompanied me, to climb the tree; and she reported 

 that the nest contained three green eggs, one of them smaller and 

 darker than the other two. As seen through the mirror next day 

 I should describe the smaller as bluish-green and the others as 

 greenish-blue. 



July 29, at 6.30 P. M. the eggs were there as usual and the bird 

 remained on the nest until I was almost under her, giving me an 

 opportunity to note her yellow bill and her graceful, horizontal 

 flight as she slipped noiselessly into another tree. The following 

 day was Sunday and was exceedingly hot as was Monday fore- 

 noon. In the afternoon of Monday, July 31, there was a severe 

 storm and the nest was not visited until the forenoon of Aug. 1, 

 when there were three young birds in it, all black as ink, the two 

 larger with black hairs (or quill cases) and the smaller with white 



