The Isolation of Tricotylous hitciincdiatc Races. 437 



race had been attained, and therefore I did not continue 

 the culture. 



Silcnc 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 

 llowering sprig. 



Fig. 88. Silcnc 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 



