ON THE QUICK GROWING WALNUT 



that "about one-third" of the second generation 

 hybrids would revert toward one parent, while 

 another third would revert toward the other 

 parent, the remainder being intermediate in char- 

 acter, and in this corresponding to the first genera- 

 tion hybrid that was their parent. 



This implies a fair understanding of the com- 

 bination of characters of the two parent species 

 in the first generation hybrid, and the segregation 

 and recombination of these characters in the sec- 

 ond generation hybrid. It will be noted also that 

 the distribution of these characters in the second 

 generation (as predicted on the basis of my obser- 

 vation of earlier seasons) was essentially that 

 which has come to be familiar everywhere within 

 recent years as the typical distribution of charac- 

 ters among second generation hybrids in what is 

 now known as Mendelian heredity. 



To be sure the figures given are only approxi- 

 mate, nor have I in any of my experiments endeav- 

 ored to keep accurate count of the precise 

 numbers, the large scale on which I operate mak- 

 ing this scarcely practicable but the close approx- 

 imation of the rough estimate that I made to the 

 precise figures that have been determined by more 

 recent investigations, sufficiently attests the accur- 

 acy of the observations on which the estimate was 

 based. 



[195] 



