TABLE XX 



sign, but none of the positive differences are statistically 

 significant, while 3 of the negative differences are from 

 4 to 8 times their probable errors. The mean of the 5 

 negative differences is — .1371, of the 5 positive differ- 

 ences + .0482, of the whole series — .0445. 



D. Weight of Seed 

 Throughout the experiments partially described in this 

 Paper, attention has been given to the weight of the indi- 

 vidual seed. From the practical standpoint, the total 

 weight of the seeds produced by the plant would have 

 been a more desirable determination, but for several 

 reasons this was not feasible. 



