Helianthus Annuus Syncotylcus. 469 
generation ; on the other it shows that this can sometimes 
be passed over, inasmuch as in a fortunate case the high 
value of 80-90% may be directly attained; notwithstand- 
ing that this never appeared until after the 55% stage 
had been reached in the species dealt with in that table. 
When I repeated the experiment described for my tri- 
cotylous race of Helichrysum bracteatum, I had to pass 
through several generations before reaching the hereditary 
value of about 50%, and this also shows that in different 
cases the same value may be reached by means of dif- 
ferent numbers of generations. We may therefore con- 
clude that the isolation of a syncotylous race takes place 
according to the same scheme as that which has been 
found for the tricotylous intermediate races. 
The general statements on page 17 of this volume 
and elsewhere relating to the isolation of eversporting 
varieties, and the apparent increase in variability, by 
which we explained the isolation of the five-leaved red 
clover, find an experimental confirmation in the present 
instance. The new race departs rapidly from the type 
of its species, but only because it is approaching its own 
new type. 
Into the group of figures given on the preceding 
page I have inserted a value for 1889 relating to the 
first-mentioned line of my race. It would take me too 
long to describe the subsequent generations singly, but, 
as is very important in the culture of such forms, they 
were treated in the same way ever year. I shall there- 
fore give the pedigree of the whole culture on the fol- 
lowing page. 
In this summary I have written at the top the per- 
centage number of syncotyls in the crops in such a way 
that the single numbers have been associated into small 
