stout: pollinations in cichorium intybus 



387 



TABLE 10 

 Reciprocal crosses giving different results 



Heads 



with no 



seed 



Heads 

 with Seeds per head 

 seed I 



Data for the reciprocal 



Seeds per head 



A X A7 



A^ X A19 



A7 X A23 



A8 X A17 



A8 X A19 



A8 X A23 



Aq X A27 



A XA8 



{A X C) no. I 



X {A X C) no. 6.... 

 {A X C) no. 5 



■X {A X C) no. 6.... 

 E3 X {Ej XA)no.3 . 

 [E22 X A) no. I 



X {E22 XA) no 3 . 

 R 1914 — no. 6 X no. 8. 

 R 1915, Ser. I — 



no. I X A 



R 1915, Ser. 5— 



no. 16 X A . . . 



2 

 17 



7 

 10 



9 

 10 



4 



3, 5. 7. 8, 9 



7. 8, 17, 17 



30 



8 



II 



5 

 6 

 6 

 I 

 12 



10 



2, 3. 13 



3, 6, 7, 8 

 6, 6 



4, 7 



2, II, 13, 14, K 

 10 



2, 5 



2 



1,4, 5 



3, 7, 10 



6, 8, 10, 10, II, 12 

 10, 13 



involve in some instances an experimental error. There were 

 also cases such as the cross A X A8 m which one reciprocal was 

 strongly fertile and the other very feebly fertile. Seven other 

 reciprocals, reported in detail in later tables, have given different 

 results and these cases are included here. In these, as a rule, 

 the fertile combination is only feebly fertile, and while the results 

 in some cases may be subject to some doubt there can be no doubt 

 from the data of table 10 that reciprocals may actually give 

 different degrees of fertility even to the extent of one being highly 

 fertile and the other fully sterile. 



Results of crosses between {A X C) pla?tts and their parents. — 

 The artificial pollinations bearing on cross-incompatibility which 

 were conducted in 19 14 and 191 5 were directed to plants whose 

 immediate parents were both known. On account of the difficulty 

 of performing all possible combinations, no series has been fully 

 completed, but the data thus far obtained are given in the following 

 tables. 



The data in table i i pertain to the crosses that were made with 

 the {A X C) plants. Six plants were used as seed-parents and 



