Mar. 24,1923 
Permanence of Variety in the Potato 
953 
is similar for both small and large tubers of the same lots. The ratio of 
width to length of tuber would therefore appear to be a very good index of 
form in the Early Ohio variety. This is more clearly shown in Table VIII, 
which shows the influence of growth conditions on the form of tubers. 
Table IV .—Correlation between width and length of tuber in the Early Ohio variety, 
grown at the North Central Experiment Station, Grand Rapids, in 1919 
Table V .—Correlation between width and length of tuber in the Early Ohio variety , grown 
at Northeast Experiment Station , Duluth, in 1919 
[Coefficient of correlation=o.847±o.o2s] 
