126 THE COTTON PLANT IN EGYPT ch.vii 



certain gametic characteristics. A detailed statistical 

 study of the composition of F^ plants resulting from such 

 mixed poUinations has been begun, and if we can find any 

 constant deflection of the frequency curves from expecta- 

 tion, we shall have a clue as to the nature of the winning 

 pollen-grains. 



In other words, our endeavour is to ascertain whether 

 diff"erences which are manifest before fertilisation exist 

 between F, gametes. Further discussion ^ would be 

 worthless at present, but any clue to gametic differentia- 

 tion deserves to be followed up. 



