Ez'crsporting J^aricfics ivifh Heritable fasciation. 511 



of the best cultivated individuals gave values l^etween 

 10 and 20%, in the course of the five generations which 

 followed. These would probably have been higher if 

 the cultures had been larger and tlie external conditions 

 more favorable, and especially if a closer searcli liad 

 been made for smaller fasciations on the lateral l)ranches. 

 We may therefore regard the constitution of this race as 

 fairly constant under normal conditions, and put it on the 

 average al)out 30-40%. 



No doubt, this fi^'ure is somewhat lower tlian the 

 normal value of tricotylous intermediate races which we 

 described in the second chapter of tliis part. In that 

 case the value was about 55% ; but this difference does 

 not seem to be of great significance, especially wlicn we 

 remember that tricotvlv is alreadv determined in the seed- 

 lings, whilst a long period of time elapses between the 

 ripening of the seed of the fasciated plants and the mani- 

 festation of its character, during which period all sorts 

 of external influences may be affecting the result. 



A second difference between tricotvlous and fasciated 

 races also demands brief notice. In the former, selection 

 soon led to a transgression of the original normal value ; 

 and values of 70 to 90% were often reached or even sur- 

 passed without much trouble. In the fasciated races, 

 on the other hand, it is very difficult to raise the value 

 above about 40%. The ex])lanation of this seems to me 

 to be as follows : In my tricotylous races a twofold se- 

 lection took place, inasmuch as, first, the tricotvlous in- 

 dividuals were selected for subsequent cultivation, and, 

 secondly, a selection was based on the proportion of tri- 

 cotylous individuals amongst their seeds. By the selec- 

 tion of the parents with the highest hereditarv values, 

 this A'alue itself was seen to increase in the following 



