The Isolation of Tricotylous Intermediate Races. 431 
among them all, the plant with 16% would, no doubt, 
have offered me as good a prospect as the corresponding 
plant of Clarkia. The chosen plant was remarkable for 
the large proportion of tetracotyls and the low proportion 
of hemi-tricotyls which it produced. There were 1 1 % 
of the former, and only \% of the 
latter. This peculiarity has reappeared 
amongst its descendants, especially with 
regard to the tetracotyls. 
In 1895 I planted out on separate 
beds tricotyls and tetracotyls of the 
parent with 41% only. Among the 
tricotyls 32 plants set plenty of seed. 
Of these one produced only 6% tri- 
cotyls, amongst the rest the values 
were distributed between 13 and 43%, 
and their mean was at 26%. The 
tetracotyls gave similar numbers, em- 
bracing 19 plants with from 14 to 42% 
and a mean of 25% ; besides these there 
was one plant with as much as 51%. 
This latter fact must obviously be at- 
tributed to a fortunate chance, and we 
may conclude that the tetracotyls are 
not more likely, nor on the other hand 
less so, to produce tricotyls than the 
tricotyls themselves, but that they ob- 
viously belong to the same race, i. e., 
that their character is brought about by the same ele- 
mentary factor. The proportion of tetracotylous seed- 
lings in this culture was very high, but not higher than 
the ratio recorded for the first generation. 
For the continuation of the race onlv seedlings of the 
Fig. 86. Hclichry- 
suin bracteatum 
compositum. A 
flowering stem of 
a plant of the tri- 
cotylous interme- 
diate race. 
