BIBLIOGRAPHY OF ECONOMIC RELATIONS OF BIRDS 171 
Wood thrushes and other true thrushes disgorge cherry 
pits; disgorgement also noticed in red-eyed vireo, myrtle 
bird, and European robin. 
1897. Reed, J. Harris. Notes on the American Barn Owl in 
Eastern Pennsylvania. The Auk, v. XIV, pp. 374- 
383. 
Occurrence, nesting habits, feeding habits. 
1897. Warren, B. II. The Army Worm. Report Pennsyl- 
vania State College, 1896, pp. 164-220. 
Record of studies of food of many birds during an army 
worm outbreak, showing that nearly all fed freely on the pests. 
1898. Adams, Stephen J. Swallow Investigations. The 
Wilson Bulletin, v. X, 0. S. No. 20, May 30, 1898, 
pp. 42-43. 
They take enormous numbers of insects; nearly, if not 
quite, all taken on the wing. Barn swallows take enormous 
numbers of apple maggot flies. 
1898. Bailey, L. H. The Birds and I. Cornell University, 
Teachers’ Leaflet, No. 10. 
Popular discussion of relations of birds to children. Pic- 
tures of many bird houses. 
1898. Beal, F. E. L. Birds that Injure Grain. U. S. De- 
partment of Agriculture, Year Book, 1897, pp. 345-354. 
After a short discussion of the damage done by birds to 
the wheat crop and the cause of increased numbers of black- 
birds, the more important noxious species are taken up in 
detail. The following are treated: Crow, crow blackbird, 
red-winged blackbird, yellow-headed blackbird, rusty graclde, 
cowbird, mourning dove, California valley quail, horned lark, 
and certain imported pheasants. 
1898. Beal, F. E. L. The Food of Cuckoos. U. S. Divi- 
sion of Biological Survey, Bulletin 9, pp. 1-15. 
General notes on North American cuckoos, followed by an 
account of the examination of 155 stomachs of both species. 
Food was found to consist almost exclusively of animal mat- 
ter. Nearly 50 per cent, of the whole was composed of cater- 
