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THE AMERICAN NATURALIST [Vol. XLVII 



two places, but this assumption is improbable. It seems 

 more likely that new buds which escaped notice were 

 developed in the course of her experiments. This ex- 

 planation of these divergent results is very probable, as 

 adventitious buds appear for several weeks after the 

 formation of the first buds. Both self -fertilized and par- 

 thenogenetic blossoms produce offspring true to the 

 mother species; and consequently an error, if it did oc- 

 cur, could not be detected. 



TABLE I 

 Field Castration Experiment 



EXPERIMENTS ON THE ARTIFICIAL PRODUCTION OF ApOMIC- 



tic Seed in the Genus Nicotiana 

 For the simplification of the following subject matter, 

 the experimental procedures used in the attempted pro- 

 duction of parthenogenetic seed have been divided into 

 four classes, namely, the effects of foreign pollen, of 

 mutilation, of fumigation, and of injections. 



