BIRDS AND FOEEST VEGETATION 37 



3. Discuss injury or harm produced by seed plantings by 

 birds ? Weeds ? Poisonous plants ? Choking out of cultivated 

 plants ? 



REFERENCES 



Burrill, T. J., 1887. The Forest-Tree Plantation. 13th Report 

 of Board of Trustees, University of Illinois, pp. 252-282. 



Burrill and McCluer, 1893. The Forest Tree Plantation. (Bul- 

 letin No. 26, Illinois Agricultural Experiment Station.) 



McAtee, W. L., 1910. Plants Useful to Attract Birds and Pro- 

 tect Fruit. Yearbook U. S. Department of Agriculture 

 for 1909. pp. 185-196. 



