The Isolation of Tricotylous Intermediate Races. 437 
race had been attained, and therefore I did not continue 
the culture. 
Silene inflata, Fig. 88. I obtained this race by pure 
chance. The stock plant was one of that series of forms 
which I had taken into cultivation, during the course of 
many years, for the purpose of finding species in a mu- 
Fig. 87. Phacelia tanacetifolia. A 
flowering sprig. 
Fig. 88. Silene inflata, A 
whole plant. 
table state (Vol. I, p. 271). A single specimen which 
had come up from seed of weeds, accidentally imported 
with cereals into our harbor, was transplanted into my 
experimental garden. The seed from this plant produced 
a proportion of 3% tricotyls, and when it flowered again 
in 1893, one of 4%. The tricotyls of the first harvest 
