1873. 
BIBLIOGRAPHY OF ECONOMIC RELATIONS OF BIRDS 145 
White, C. A. Woodpeckers tapping Sugar Trees. 
American Naturalist, v. Ill, p. 496. 
Short article about red-headed woodpeckers rupturing 
the bark of sugar maples for purpose of obtaining the sap. 
1874. Bailey, L. II., Jr. Birds. Third Annual Report Sec- 
retary State Bornological Society of Michigan for 1873, 
pp. 127-128. 
Insect-feeding habits of several common singing birds of 
Michigan. 
1874. Boyce, Caroline. The Robin. American Naturalist, 
v. VIII, pp. 203-208. 
Habits, food, nesting, broods, time of brooding. 
1874. Lang, J. W. The Value of Insect Eating Birds. New 
Hampshire Agricultural Report, 1873, v. Ill, pp. 
Introduction, followed by a synopsis of families with chief 
characteristics; a discussion on the food of birds with some 
apparently new data on stomach contents in a few instances 
and concluding remarks on the necessity of a proper balance, 
the usefulness of birds in general, and a plea for their pro- 
tection. 
1874. LeBaron, Wm. The Bird Question. Transactions 
Illinois State Horticultural Society, 1873, v. VII, pp. 
311-319. 
Discussion of the economic importance of birds. 
1875. Palmer, Frank H. Insect Eating Birds, the Farmer’s 
Best Friends. Boston, Mass., Societ} 7 Prevention 
Cruelty to Animals, 1875. 
A prize essay and an admirable discussion. 
1875. Wheaton, J. M. The Food of Birds as Related to 
Agriculture. Ohio Agricultural Report for 1874 
(1875), pp. 561-578 (Sept., 1875). Also reprint, re- 
paged but otherwise unchanged, pp. 1-18. 
“ This is in effect a corrected and completed list of the 
birds of Ohio, brielly annotated, and with the general food 
