Eversporting Varieties with Heritable Fasciatiou. 511 
of the best cultivated individuals gave values between 
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 the external conditions 
more favorable, and especially if a closer search had 
been made for smaller fasciations on the lateral branches. 
We may therefore regard the constitution of this race as 
fairly constant under normal conditions, and put it on the 
average about 30-40%. 
No doubt, this figure is somewhat lower than the 
normal value of tricotylous intermediate races which we 
described in the second chapter of this part. In that 
case the value was about 55%; but this difference does 
not seem to be of great significance, especially when we 
remember that tricotyly is already 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 tricotylous 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 explanation of this seems to me 
to be as follows : In my tricotylous races a twofold se- 
lection took place, inasmuch as, first, the tricotylous 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 hereditary values, 
this value itself was seen to increase in the following 
o 
