478 



S\)icof\'Ious Races. 



portion of hemi-syncotyls among the seedlings, i. e., that 

 ])arent was chosen which produced the highest percentage 

 of hemi-syncotyls, no regard heing paid to the numher of 

 syncotyls produced. 



I shall now give the values of these selected parents 

 for several generations in tabular form : 



HEMI-SYNCOTYLOUS RACE. 



HEREDITARY VALUE OF THE SEED-PARENTS SELECTED FOR THE CONTINUA- 

 TION OF THIS RACE. 



In this table the degree of symphysis in the cotyledons 

 is given for each parent selected. This was, where pos- 

 sible one-half, i. e., the cotyledons were fused along half 

 the distance between the upper end of their petioles and 

 their tips. In the earlier years this was more or less a 

 matter of chance, and in tlie harvest of 1890 it was by 

 no means the plant with the highest degree of fusion that 

 gave the best hereditary value. Later. I could limit my- 

 self to planting out those seedlings in which tlie fusion 

 had only extended half-way and so I only determined 

 the values from these. 



The first row of the table (1889) refers to that indi- 

 vidual of the syncotylous race (p. 470), whose offspring 

 constituted the basis for this special culture. The selec- 



