Variation and Correlation in Timothy. 



431 



plants to this disease. Some plants show great susceptibility to the 

 attacks of this fungus, being completely covered with the pustules. 

 . On the other hand, a few plants have been observed which are very 

 nearly immune. 



Variation in yield. — There is a wide range of variation in the yield 

 of hay, as will be seen by an inspection of Table IV. 



TABLE IV — Frequency Distributions for Weight 



As measured by the coefficient of variability, weight shows greater 

 variation than any of the other characters studied statistically. (See 

 Table V.) The lowest yield obtained was .01 pounds, while the maxi- 

 mum, which was reached in 1905, was 1.35 pounds. 



