STUDIES IN TERATOLOGICAL PHENOMENA 
27 
on its expression. De Vries classified it as an ''eversporting" variety. 
Although it was possible almost to destroy the character or inhibit 
the expression of its hereditary elements by modifying the environ- 
ment, it was never absolutely eliminated by this treatment. In 
addition to the action of the external surroundings, internal factors 
must have had some part in making this an extremely sensitive char- 
acter, because poppies, like corn, are cross-fertilized, and hence are 
more or less heterozygous, and, while the external conditions are no 
Fig. I. Nicotiana flower showing pistillody. 
doubt very important for the characteristic development of the 
anomaly, the eversporting condition one may ascribe at least partially 
to the effect of segregating genes. 
The race of pistilloid Nicotianas with which I experimented origi- 
nated from the guarded seed of a single anomalous mutant which 
was discovered among the segregates of an F2 generation from N- 
langsdorffii X N. alata. Two or three hundred of these F2 plants 
