356 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



show that of the 60 Fi plants polHnatecl from the parent B, 46 set 

 some seed, although in Correns' grouping only 32 are credited as 

 being fertile: pollen from the parent G gave some seed in 52 cases, 

 but Correns credits 30 as being fertile. To summarize in tabular 

 form the actual results and the grouping as given by Correns: 



Correns' whole interpretation rests largely on the classification 

 of the plants into nearly equal groups, to obtain which it is neces- 

 sary to consider 35 cases of feeble fertility as fully sterile and il 

 cases of no fertility as fully fertile. 



In table j Correns gives the results of all possible reciprocal 

 pollinations involving eight of the progeny and both parents. 

 One pair of reciprocals involving parent Bb and offspring of the 

 BG class were sterile; but in another pair (B with i m.) both were 

 fertile. The pair involving Bb and Bg were both sterile; hence 

 the "g" pollen of Bg was inhibited hy B or b of the stigmas of Bb; 

 and in the reciprocal cross, "6" pollen was inhibited by the alto- 

 gether different substances "5" or "g". Of the two pairs of 

 reciprocals involving parent Gg and offspring BG, one pair were 

 sterile and one pair fertile to some degree. Three pairs gave 

 different results: Gg X bG (plant / ae) was sterile, the reciprocal 

 feebly fertile; Gg X Bg (plant 2 b) was sterile, the reciprocal was 

 strongly fertile; Gg X bG (plant 2 e) was sterile, the reciprocal was 

 feebly fertile. Of the other thirteen pairs of reciprocals each pair 

 gave the same result; the interaction between pistils and pollen was 

 the same irrespective of the fact that no two of the plants concerned 

 possessed the same combination of line stuffs. 



Correns made over 700 of the 3,540 possible cross-pollinations 

 between the 60 offspring and these were well distributed to give 

 adequate tests of the interrelations of the four classes. The plants 

 classed as bg which should, according to assumption, be cross- 

 fertile to all other plants met the exjXTtation more fully than any 

 other class, as out of 341 cross combinations involving bg plants 

 as one or both parents only 48 were fully sterile. Combinations 

 in\'()l\'ing BG plants with Bg, bG, or BG plants should be sterile; 



