1915] BARTLETT—MUTATION IN OENOTHERA 93 
show the complete identity, at this stage of growth, of different 
individuals of mut. nummularia, and also the great uniformity of 
the typical plants of the culture. 
lexington C {st pan 
a : to Beis 
—F; progeny of Oenothera pratincola, Lexington C, pan 1: the only muta- 
tion sm is Lexington C-10, mut. mwmmularia; the other plants are typical O. 
Pratincola; about the same age as the plants shown in fig. 3 
In addition to the 4 plants of mut. nummularia which were dis- 
covered in the second sow ing, there were solitary specimens of each 
of two other mutations, one plant (no. 12) like no. 7 of the first 
planting, and another (no. 18) unlike anything else in the culture. 
No. 18 had exceedingly narrow, red, subulate seedling leaves and 
