PLATE 31 



Tiie number of flowers measured between October 2 and November 8 

 on single plants of varieties I, II and III of N. acuminata and of cross 

 I?X IIIc^, III$X Ic?, I$X II c^, II $X IIIc?, and III$X lid". In the 

 case of the figure in the upper right-hand corner of the plate the number 

 of flowers measured on all the plants representing the cross I$X II J' 

 is shown. 



[162] 



