116 BOTANICAL GAZETTE [FEBRUARY 
mutations were actually unconnected with the parent form by 
intermediates, which might have been overlooked in classifying 
the young seedlings. An endeavor has been made to forestall the 
same criticism of the writer’s work on O. pratincola by the publication 
Lexigtor? C222 Stare LO 
iti me fCD LPF 
Fic. 12.—F, progeny of Lexington C, Oenothera pratincola (pan 10 of the progeny 
of C-22); the only mutation shown is C-22-20, mut. nummularia; the other plants 
are typical O. pratincola. 
of a series of photographs showing some of the pans in which 
the mutations occurred. Each reader can judge for himself as to the 
discontinuity of the mutations from the rest of the plants. It is 
believed that no one has heretofore published so extensive a series 
of photographs representing random samples of cultures from which 
