82 De Vries: ATAVISTIC VARIATION IN OENOTHERA 
I give, above, the description of my whole race in the form of a 
pedigree, omitting the sectorial and bud-variations, again remind- 
ing the reader that in every case the seed-bearing plants were 
fertilized only with their own pollen after enclosure in bags of pre- 
pared parchment-paper. 
Though the figures of this experiment are but small, they seem 
to be sufficient to prove the presence of a very curious case of 
variability, the alternation between the typical cruciate flowers of 
the species and the atavistic petals of the group to which the 
species belongs, and to justify the provisional name chosen for my 
race: Oenothera or Onagra cruciata varia. 
AMSTERDAM. 
