140 LUTHER BURBANK 



the seedling comes out of the ground ; the colors 

 being pale yellow, bright yellow, orange, or 

 green. 



(3) The color of the seed coats; white, as is 

 usual in peas with white flowers, or gray, gray- 

 brown, leather-brown, with or without violet 

 spots, etc. 



(4) The form of the ripe pods, whether in- 

 flated or constricted or wrinkled. 



(5) The color of the unripe pods, whether 

 light or dark green or vividly yellow, these colors 

 being correlated with colors of stalk, leaf, vines, 

 and blossoms. 



(6) The position of the flowers, whether axil- 

 lary or terminal. 



(7) The length of the stem of the plant itself, 

 whether tall or dwarfish. 



It is obvious that in each case the different 

 qualities named are antagonistic or mutually 

 exclusive. The seed cannot be at the same time 

 round and angular ; it cannot be at the same time 

 smooth and wrinkled; cotyledons cannot be at 

 once yellow and green; the pods cannot be at 

 once inflated and constricted. And as each race 

 of peas, when inbred, holds true to its type, there 

 was opportunity to observe the effects of cross- 

 ing the different races in relation to these differ- 

 ent fixed characters. 



