Variation and Corrflation in Timothy. 



423 



The plants were visited every day during the blooming period with 

 the exception of Sundays and those days when, because of weather 

 conditions, the plants failed to bloom, and careful notes taken on the 

 beginning and end of bloom of each plant. Notes were also taken on 

 the other characters discussed in this paper, though no statistical data 

 were collected except in the cases of height and yield as has already 

 been stated. The 

 notes for 1905 were 

 taken under the di- 

 rection of Mr. Samuel 

 Fraser, then Assistant 

 Agronomist at the 

 Cornell University 

 Experiment Station. 

 In 1906 and 1907 the 

 work was under the 

 supervision of the 

 writer. A few notes 

 were taken in 1904, 

 but because of the 

 small size of the 

 plants, which were 

 started late the pre- 

 vious autumn, and 

 the incompleteness of 

 the records, it was 

 thought inadvisable 

 to use the data for 

 that season which 

 would hardly be 

 comparable with 

 those obtained after 

 the plants had more 



Fig. 112. 



Timothy plats sliozciiig arrangement of plants 

 in the field. 



nearly approached their normal development. 



The formulas employed in calculating the various constants are those 

 given by Davenport (1904), using the short method for determining the 

 mean and standard deviation and Yule's formula for the coefficient of 

 correlation. 



In calculating the constants for earliness, the days of the month when 

 the plants were in bloom were taken as the classes, the first day on 

 which blooming began during a given season being Class i. 



