1919] 



Frost: Mutation in MatthioJa 



109 



Table 15 

 1911, field; plants transplanted from greenhouse. Plants alive November 3, 



not having flowered. Singles. 



" Omitting non-flowering apparent mutants. For the numbers in parenthesis, 

 "doubtful mutants" are classed as mutants. Two plants accidentally seriously 

 injured, in lots 14 and 25, were counted out with the mutants. 



"' The stem-rot disease (see p. 108) was evidently worst in lot 22; some two or 

 three of the worst infected plants (included above) were nearly or quite dead 

 by November 3. 



Table 16 



Same as table 15, for doubles. 



" See notes to table 15. 



