GABRIELLE L. C. HOWARD. 43 



have no hesitation in saj^ng that under the conditions obtaining 

 at Pusa in ordinary hybridization work, parthenogenesis in 

 N. tabacum is neghgible. 



It is interesting to note that in the details given by Jensen^ 

 of an experiment undertaken to test the possibihty of \\dnd 

 polHnation in N. tabacum, no mention is made of the formation 

 of apogamous seed. Four plants bearing 119 castrated flowers 

 were covered by a net and so placed that the prevailing wind 

 must bring pollen to them. In none of the flowers did any seed 

 set. The uniformity of the Fj generation and the identity of 

 the reciprocals has also been mentioned by Jensen and by 

 Hayes.- 



^ Jensen, I.e. 

 * Hayes, I.e. 



