168 BIBLIOGRAPHY OF ECONOMIC RELATIONS OF BIRDS 
1896. Richards, Harriet. The Birds at Dinner. Popular 
Science Monthly, v. XL1X, p. 387. 
Nearly all birds feed their young on insects, worms, or 
some form of animal food, and also depend mainly on that 
food for themselves at that busy season, although at other 
seasons their favorite food may be grains and berries. 
1896. Warren, B. II. Our Home Birds. Pennsylvania Agri- 
cultural Experiment Station Report, 1895, pp. 244- 
265. 
Popular account of the birds of Pennsylvania and discus- 
sion of the value of birds as destroyers of vermin and the 
danger of destroying them. 
1896. Warren, B. H. Taxidermy; How to Collect, Skin, 
Preserve, and Mount Birds. Pennsylvania Depart- 
ment of Agriculture, Division of Economic Zoology, 
Bulletin 6, p. 128. 
A condensed account of methods for collecting, skinning, 
preserving, and mounting birds; followed by the game laws 
of the state. 
1897. Anthony, A. W. The Roadrunner as a Destroyer of 
Caterpillars. The Auk, v. XIV, p. 217. 
Roadrunners in California feed on caterpillars of Agraulis 
rani lice, which attack leaves of passion vines. 
1897. Bailey, Wm. L. Disgorgement of Cherry Stones again 
Noted. The Auk, v. XIV, pp. 412-413. 
Cherry stones disgorged by young robins, catbirds, and 
wood robins (thrush?). 
1897. Beal, F. E. L. Recent Investigations of the Food of 
European Birds. The Auk, v. XIV, pp. 8-14. 
Review of papers by Hollrung and Gilmour; remarks on 
methods of estimating percentages of food. 
1897. Beal, F. E. L. The Blue Jay and its Food. U. S. 
Department of Agriculture Year Book, 1896, pp. 197- 
206. 
General remarks on habits and distribution of blue jay, fol- 
lowed by an account of examination of 292 stomachs. The 
bulk of the food was found to be of vegetable origin, largely 
