336 SELF-STERILE PLANTS. CHAP. IX 



two seeds, which germinated well. A large number of 

 the stigmas on several of the other corymbs were re- 

 peatedly smeared with pollen from their own corymb ; 

 but they yielded only five very poor seeds, which were 

 incapable of germination. Therefore the above three 

 plants belonging to two varieties, though growing 

 vigorously and fertile with pollen from either of the 

 other two plants, were utterly sterile with pollen from 

 other flowers on the same plant. 



Reseda odorata. Having observed that certain in- 

 dividuals were self-sterile, I covered during the 

 summer of 1868 seven plants under separate nets, and 

 will call these plants A, B, C, D, E, F, G. They all 

 appeared to be quite sterile with their own pollen, 

 but fertile with that of any other plant. 



Fourteen flowers on A were crossed with pollen 

 from B or C, and produced thirteen fine capsules. 

 Sixteen flowers were fertilised with pollen from other 

 flowers on the same plant, but yielded not a single 

 capsule. 



Fourteen flowers on B were crossed with pollen 

 from A, C, or D, and all produced capsules ; some of 

 these were not very fine, yet they contained plenty of 

 seeds. Eighteen flowers were fertilised with pollen 

 from other flowers on the same plant, and produced 

 not one capsule. 



Ten flowers on C were crossed with pollen from A, 

 B, D, or E, and produced nine fine capsules. Nineteen 

 flowers were fertilised with pollen from other flowers 

 on the same plant, and produced no capsules. 



Ten flowers on D were crossed with pollen from 

 A, B, C, or E, and produced nine fine capsules. 

 Eighteen flowers were fertilised with pollen from other 

 flf wers on the same plant, and produced no capsules. 



Seven flowers on E were crossed with pollen from 



