FERTILITY IN CICHORIUM INTYBUS 



385 



Table 2 — Continued 



Table 14) made it somewhat difficult to limit the parentage of the 

 various series to the same parents, which would, of course, be highly 

 desirable. Thus it happens that the immediate parents of these 

 series are not the same as those of the series reported in Table i ; the 

 plants involved are, however, closely related sister plants. 



In making the cross-pollinations between the self-sterile parents 

 here involved, no attempts were made to emasculate or to depollinate 

 the seed parent. In brushing a flower head of a prospective seed 

 parent with a flower head from a plant selected for a pollen parent, 

 there was necessarily a full and rather thorough mixture of the two 

 lots of pollen with apparently an equal chance that both should be 

 distributed on stigmatic surfaces. A total of 54 plants were derived 



