Self Sterility and Cross Sterility in the Apple. 83 



10. See reference 4. 



11. See reference 11. 



12. Close, C. P. 



1902. Report of the Horticulturist. In Fourteenth Annual Report 

 of the Delaware Agricultural Experiment Station, p. 102. 



13. Wicks, W. H. 



1918. The effect of cross pollination on size, color, shape, and qual- 

 ity of the apple. In Bui. 143. Arkansas Agricultural Expt. Sta. 



14. Vincent, C. C. 



1915. Report of the Department of Horticulture. In Bui. 84, 

 Idaho Agricultural Experiment Station, p. 24. 



