324 APPENDIX 



a hybrid-character, on the other hand, it must maintain the same 

 behaviour as in the first generation [F2]. 



[F3] The Second Generation [bred] from the Hybrids 



Those forms which in the first generation [F2] exhibit the reces- 

 sive character do not further vary in the second generation [F3] as 

 regards this character; they remain constant in their offspring. 



It is otherwise with those which possess the dominant character 

 in the first generation [bred from the hybrids]. Of these ^M'o-thirds 

 yield offspring which display the dominant and recessive char- 

 acters in the proportion of 3 to 1, and thereby show exactly the 

 same ratio as the hybrid forms, while only one-third remains with 

 the dominant character constant. 



The separate experiments yielded the following results: 



Expt. 1. Among 565 plants which were raised from round seeds 

 of the first generation, 193 yielded round seeds only, and re- 

 mained therefore constant in this character; 372, however, gave 

 both round and wrinkled seeds, in the proportion of 3 to 1. The 

 number of the hybrids, therefore, as compared with the constants 

 is 1.93 to 1. 



Expt. 2. Of 519 plants which were raised from seeds whose 

 albumen was of yellow colour in the first generation, 166 yielded 

 exclusively yellow, while 353 yielded yellow and green seeds in the 

 proportion of 3 to 1. There resulted, therefore, a division into 

 hybrid and constant forms in the proportion of 2.13 to 1. 



For each separate trial in the following experiments 100 plants 

 were selected which displayed the dominant character in the first 

 generation, and in order to ascertain the significance of this, ten 

 seeds of each were cultivated. 



Expt. 3. The offspring of 36 plants yielded exclusively grey- 

 brown seed-coats, while of the offspring of 64 plants some had 

 grey-brown and some had white. 



Expt. 4. The offspring of 29 plants had only simply inflated 

 pods; of the offspring of 71, on the other hand, some had inflated 

 and some constricted. 



Expt. 5. The offspring of 40 plants had only green pods; of the 

 offspring of 60 plants some had green, some yellow ones. 



Expt. 6. The offspring of 33 plants had only axial' flowers; of 

 the offspring of 67, on the other hand, some had axial and some 

 terminal flowers. 



