Inheritance of Acquired Characters 27 



inheritance of acquired characters impossible; but the 

 situation in plants is distinctly different. 



In closing, we quote the opinion of East (2) : 



My confession of faith is, the environment has been an 

 immense factor in organic evolution, but its effects are shown 

 either so infrequently or after the elapse of so great a time, that 

 for the practical purposes of plant breeding we can neglect it as we 

 would neglect an infinitesimal in a calculation. 



1. BoLLEY, H. L., The importance of maintaining a constant 

 elimination factor in plant breeding. Ann. Rep. Amer. 

 Breeders Assoc. 8:508-514. 1912. 



2. East, E. M., The bearing of some general biological facts on 

 bud-variation. Amer. Nat. 51:129-143. 1917. 



3. Engler, Arnold, Influence of source of seed. Jour. Heredity 

 5:185-186. 1914. 



4. Mayr, H., Waldbau auf naturgesetzlicher Grundlage. Berlin. 

 1909. 



5. SuD WORTH, Geo. B., Report of committee on breeding nut and 

 forest trees. Ann. Rep. Amer. Breeders Assoc. 8:515-522. 

 1912. 



6. Walter, Herbert E., Genetics. New York. 1913. 



