100 BREEDING 



which kind there are also two in every nine. And, 

 lastly, (4) a kind that does not breed true to, but is 

 hybrid in respect of, both its characters, and produces 

 all four kinds — yellow round, yellow wrinkled, green 

 round, and green wrinkled. Of this kind there are 

 four in every nine on the average. / On the opposite 

 page are given the actual characters of the seeds 

 of ten plants which were all raised from the yellow 

 round seeds of a hybrid generation, such as that 

 which we have considered ; it will be seen that there 

 are two instances of the first kind (Plants Nos. 5 and 

 8), one of the second (Plant No. 7), two of the third 

 (Plants Nos. 1 and 4), and five of the fourth kind 

 (Plants Nos. 2, 3, 6, 9 and 10). Of course it does not 

 always happen that, in a sowing of ten seeds, repre- 

 sentatives of each of the four kinds occur. Nor, 

 when they do occur, amongst ten plants is there 

 likely to be a close approximation to the ratio given 

 above. The composition of the second hybrid genera- 

 tion we are considering may, therefore, be summarised 

 as follows : — 



1. Yellow round — 



