1919] 



Frost: Mutation in Uatthiola 



111 



The last column, with the apparent mutants omitted, no doubt gives 

 the best comparison. The data for the singles, reduced to percentages, 

 are also given in chart 2. 



The doubles, which are often earlier to flower than the singles under 

 unfavorable climatic conditions, flowered so generally that table 16 

 presents no significant differences. The singles (table 15), however, 

 give definite evidence of segregation ; the lots in rows 2, 5, 6, and 9 to 

 11 all show a tendency to early flowering. Lot 26, consisting of Fj 



Table 17 



1911, field; plants transplanted from greenhouse. Singles icitli primary 

 inflorescence flowering or aborted as indicated.^ 



"In this table and also in table 18 the numbers in parenthesis include the 

 probable but somewhat doubtful cases. 



progeny of WGQ-CIO, is decidedly earlier than the adjacent lots. 

 Lot 25 also appears early, however. 



Tables 17 and 18 give a direct measure of earliness, relating to the 

 primary inflorescence alone. The clusters visibly aborted were in 

 general relatively far advanced, and those aborted at the earlier date 

 correspond to decidedly early flowering; consequently the flowering 

 and aborted clusters are classed together as early. Chart 3 gives the 

 percentages for singles. 



Here the data for the doubles show fairly consistent differences in 

 the number aborted at the earlier date, while the October totals are 



