IN THE TROPICS : III. 



155 



The numbers given above appear to prove rather too much, 

 since the effect of the pollen of Nos. 1-13 might be expected to 

 have raised the percentage of white in the remaining plants to a 

 value higher than 25 per cent. Thus plants No. 14-46 if mu- 

 tually pollinated by themselves would have yielded on the 

 average less than 25 per cent, of white grains. The difference 



