32 . LABORATORY DIRECTIONS 



2. If you wish to protect cultivated fruits from the depre- 

 dations of birds, what kinds of wild fruits should be planted to 

 serve as food ? In this connection it is necessary to keep in mind 

 the time of ripening of the cultivated and wild fruits. 



3. What injury or harm is produced by seed plantings by 

 birds? Weeds? Poisonous plants? Choking out of cultivated 

 plants ? 



REFERENCES 



Burrill, T. J., 1887. The Forest-Tree Plantation. I3th Report of 

 Board of Trustees, University of Illinois, pp. 255-282. 



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. 



