INHERITED SEED-CHARACTERS 6i 



ratio of three to one ; and one (dominant) plant with 

 yellow first two leaves will give rise solely to plants 

 like itself. The mode of inheritance of the colour 

 (whether yellow or green) of the first two " leaves," 

 or cotyledons, of the plants is therefore precisely 

 analogous to that of the stature (whether tall or 

 dwarf) of the plant. And if the reader wishes to see 

 the inheritance of the colour of the cotyledons set 

 forth in diagrammatic form, all that is necessary 

 is to substitute yellow for tall and green for dwarf 

 in the frontispiece. 



But in order that the way in which this result 

 appears on the plants themselves may be under- 

 stood, I give, on the next page, an actual instance 

 of the total numbers of yellow and green " seeds " 

 constituting the second hybrid generation ; and also 

 of the total numbers of yellow and green " seeds " 

 constituting the third hybrid generation. 



The crosses were made by me in 1905 ; the 

 second hybrid generation (which I give here) 

 was recorded in the autumn of 1906 ; and 

 the third hybrid generation was recorded in the 

 autumn of 1907. By " plant number " is simply 

 meant the number by which a particular plant was 

 named in the records of my experiments. In the 

 first column to the left of the Table are given the 

 number of yellow and green seeds constituting the 

 second hybrid generation. It will be seen that every 

 one of the twenty-six plants bears both yellow and 

 green seeds ; in other words, every plant, of the 

 first hybrid generation, produces, after self-fertilisa- 



