\ariatiox and Correlation in Timothy. 



451 



of plants will come into bloom at that time. This is undoubtedly 

 responsible for the large percentage of individuals in the principal modal 

 class in 1905. It will be seen- (Table V) that the values of all the con- 

 stants determined were highest in 1905 and lowest in 1906. 



2 4 y t S ^ /o // 2? "^ /( /7 49 /f Zo 



z?d?K 0/ /yoz??/? 



Fig. 140. Place variation in earliness. 



Place variation in duration of bloom. — An inspection of Fig. 141 shows 

 a marked change in the distribution during the three years. In 1905 

 the empirical modes were at 8 and 13, in 1906 at 13, 15 and 17, while 

 in 1907 there was btit one mode and that at 13. 



One noticeable ■ feature is the shiftinii (jf the distribution toward 



