1915] 
BARTLETT—MASS MUTATION 
433 
number to be 28. For a figure showing the mature stem of f. 
typica the former article on O. pratincola in this journal? should be 
consulted. 
IG. 1.—Progeny of Lexington E-5, pan 5 (part of culture 2; see table II); the 
pan contained 23 rosettes which were classified, most of them at maturity, as follows: 
Row £ 2 3 4 5 
Bein os | typica pica acea 
ey albicans ice typica | setacea | setacea 
Saviek setacea albicans (no. 187;| typica | setacea | setacea 
fig. 11) 
Risecc: typica | se enon setacea | typica | setacea 
$. | setacea | setacea 
| 
typica 
