430 
Tricotylous Races. 
tAveen 16 and 79% and gave a mean of 49%. The race 
could therefore be regarded now as perfectly pure. 
Helichrysum bracteatum cornposituin, Fig. 86. From 
the same set of sowings as that which contained Clarkia, 
I planted out some tricotylous seedlings of Helichrysum. 
There was a relatively large number of them, and alto- 
gether 19 set seed. For each one the value was calcu- 
Fig. 85. Clarkia pulchella alba. A flowering sprig. 
lated separately. In the case of 15 plants these were 
distributed between 2 and 8% and exhibited a mean of 
4% ; but there were higher figures besides, viz., 12 12 
16 and 41%. The latter plant was obviously a repre- 
sentative of the intermediate race sought for; the re- 
mainder were thrown away as doubtful, although if 
there had not happened to be such a favorable plant 
