22 



GEORGE HARRISON SHULL 



brids between the several selfed lines. From each of the grain-row classes, 

 several good ears were saved for planting in the spring of 1905, and the rest 

 was used as horse feed. 



The plantings from this material were made on May 25, 26, 27, 1905, again 

 with my own hands, in the form of an ear-row planting. Two ears from each 

 grain-row class of the 1904 crop were used. The seeds were taken from the 

 mid-region of each seed ear. An additional row was planted from grains of 

 each of the two parent ears with 16 grain-rows. Only modified basal grains 

 and modified distal grains for the two halves of the same row in the field 

 were used. In Table 2.1 these cultures from modified grains are indicated by 



TABLE 2.1 



GRAIN-ROW COUNTS OF PROGENIES GROWN IN 1905 FROM PARENT 



EARS SELECTED FOR DIFFERENT NUMBERS OF 



GRAIN-ROWS IN NOVEMBER, 1904 



* The significance of the A and B in this column involved the plan to use the A rows for selfing and the B 

 rows to be crossed with mixed pollen of plants in the corresponding A rows. 



t The subscript b signifies the use for planting of only the modified basal grains of the given ear; and the sub- 

 script p refers to the planting only of modified grains at the "point" or distal end of the ear. 



t C represents an added row grown to increase the probability of finding ears with still higher numbers of 

 grain-rows. 



Ab and Bb for the basal grains, and Ap and Bp for the modified "point" 

 grains. A second row was planted from each of the two chosen ears having 16 

 grain-rows, and these additional rows (A8 and AlO) were detasseled, begin- 

 ning July 24, 1905, and received pollen from the intact plants in the corre- 

 sponding rows (A7 and A9) beside them. 



In harvesting these two pairs of rows, one detasseled, the other intact, the 



