The Isolation of Tricotylous Intermediate Races. 429 
respectively. The values for the two groups did not 
differ essentially, and were distributed between 51 and 
92%, and the mean of the 25 plants (the rest had been 
male) was 73%. The race had, therefore, in compari- 
son with the previous year, undergone a further im- 
provement. 
It was continued one year more in the same way 
(1897). 12 female and several male tricotylous off- 
spring of the parent with 92% were planted out, and the 
values calculated from these were found to be distributed 
between 65 and 91%, with a mean of 78%. 
We see, therefore, that after the figure 55% had 
been reached in the harvest of 1894 the mean value rose 
in the three following years of the experiment to 67, 73 
and 78%. 
Clarkia pulchella, Fig. 85. It was in the spring of 
1895 that I made the extensive sowings of horticultural 
seeds to which I have already referred, for the purpose 
of isolating tricotylous intermediate races. The seeds 
of Clarkia pulchella alba produced about 1% tricotyls. 
30 of these flowered, but only 18 of them produced suf- 
ficient seed. Two of them had hereditary values of 14 
and 16%, the rest from to 7%, with a mean of 4%. 
In 1896 only the tricotyls of the parent with 16% were 
planted out. There were 39 of these, and for all of them 
a value could be calculated. These values have been given 
on page 422, and were above 50% for eight plants. The 
intermediate race, therefore, was already represented by 
several specimens. 
In 1897 I planted out only the tricotylous seedlings 
of the plant with 64%, and saved the seeds of 39 
of them. Their hereditary values were distributed be- 
