The Isolation of Tricotylous Intermediate Races. 435 
Let us now summarize the whole culture, which ex- 
tended over six years. We obtain the following series: 
VALUES IN THE HARVESTS OF 
1892 1893 1894 1895 1896 1897 
Highest value 7 8 25 41 79 79 
Mean " 5 6 13 26 50 64 
Lowest 22 7 15 22 48 
As already stated, the intermediate race had therefore, 
in this case been isolated only gradually from the mix- 
ture, chiefly as the result of the originally small extent 
of the cultures. 
Papai'cr Rhoeas. In 1895 I selected 21 tricotylous 
seedlings from a sowing of the double garden variety 
of this plant with mixed colors. They yielded an abun- 
dance of seed, which gave the following percentage of 
tricotyls, counted in groups of 300 seedlings each: 
18 
19 
19 
20 
12 
12 
7 
7 
8 
4 
4 
4 
4 
6 
0.5 
1 
1 
1 
1 
This group plainly exhibits two sections, a half curve 
with an apex at 1 % and 4 seed-parents with the proportion 
of 18 to 20%. Obviously these four belong to the inter- 
mediate race sought for, whilst the rest are partly hybrids 
between the two races. The best tricotylous seedlings of 
the two parents with 18 and 19% were planted out in 
1896. They flowered and set an abundance of seed. 
The determination of the hereditary values from lots 
of 300 seedlings each gave a result for one of the two 
parents, with 24 offspring, of 10 to 56% with a mean 
of 19%, and for the other from 10 to 53% with a mean 
of 26%. Seedlings were planted out from the two best 
