The Isolation of Tricotylous Intermediate Races. 433 
spring (1893) the proportions 2 A 7 and 7% of tri- 
cotylous seedlings, counted in lots of from 300 to 500. 
I only planted out the seedlings of one of the plants with 
7%, but the experiment was not successful, and only 
three tricotylous plants gave a sufficient quantity of seed. 
Their hereditary values were 2 8 and 8%. The seed- 
lings of one of the best plants were planted out in 1894. 
In this year I had twelve tricotylous plants for which I 
could calculate the values. With two exceptions, they 
were distributed between 7 and 19%, but the exceptions 
attained 23 and 25%, the mean of the whole group being 
13%. In 1895 the tricotylous seedlings of the two best 
parents were planted out in separate groups. The mean 
numbers of these differed considerably ; but both attained 
a proportion of 41% as maximum. The parent with 
23% had produced offspring the values of which were 
distributed between 7 and 31% (18 plants with a mean 
of 17% and one plant with 41% tricotylous grand- 
children; whilst the parent with 25% gave values from 
15 to 31% amongst 12 offspring, with a mean of 26%, 
and two specimens with 41%. In conformity with the 
principles of selection of the grandparents, the three 
plants with 41% were not regarded as analogous, and 
only the offspring of the parent with 25% and with a 
mean, calculated from its grandchildren, of 26% were 
planted out. The progeny of the third plant with 41% 
were considered as of inferior value and thrown away. 
In the following spring, when the values were cal- 
culated, no essential difference could be detected between 
the two groups of my culture of 1896. In percentage 
calculated from lots of 300 seedlings these figures were 
as follows : 
