SELECTIVE FERTILIZATION IN POLLEN MIXTURES. 



26l 



MATERIALS USED AND PRESENTATION OF THE RESULTS. 



The figures obtained from the preliminary experiments in 

 which pairs of single plants only were used are not given here 

 because the numbers are too low to give the results much value 

 and for fear of making this report too bulky. It is sufficient to 

 remember that the data taken together indicated a slight selec- 

 tive action favoring the plant's own pollen. 



TABLE II. 



SUMMARY OF ALL THE POLLEN MIXTURES GIV.ING THE TOTAL NUMBER OF SEEDS, 

 THE NUMBERS IN EACH CLASS FORMING PROPORTIONS, THE DEVIATIONS OF 

 WHICH, EXPRESSED AS PER CENT., FROM THE CLOSEST TRUE PROPORTIONS, ARE 

 ALMOST WHOLLY IN FAVOR OF THE PLANT'S OWN POLLEN. P is THE PROB- 

 ABILITY THAT THESE DEVIATIONS ARE DUE TO THE DIFFERENCES OF RANDOM 



SAMPLING. 



Of those experiments in which pollen was applied to several 

 plants of the same type 20 pollen mixtures in all have been made. 



