380 



Bulletin 181. 



The observer, however careful, is likely to Jump at conclusions ; 

 the experimenter tries to give due weight to every influence which 

 might bear on the problem. Since many observers and a few 

 experimenters have found what seems to be an immediate influence 



88. — Longfield. From Greening p( lien below, from Lon g field pulkn above. Murked 



benefit from cross-pdlination. 



of pollen on the fruit, we cannot doubt but that this influence is 

 sometimes exerted. But it is certainly much less frequent than is 

 commonly supposed. 



The Distribution of the Pollinizers. 



Having selected a poUinizer with reference to simultaneous bloom- 

 ing and mutual affinity, the fruit-grower now wishes to know how 

 many trees will be necessary to pollinate the self-sterile variety. 

 There are three things to be considered here ; The ability of the 



