9 



If instead of taking the sum of the weights of grain and 

 straw as the criterion of yield, we take the weight of the 

 grain alone, we arrive at the following: 



The very large or 5.25 grade excelled in 58.3 % of the trials. 



large " 2.00 n " n 93.1 " " " n 

 n medium " 2,50 " " " 86. E " " " " 



As before, we find, however, that the victories of the 

 large seed are more decisive than those of the small seed, 

 and this must be taken into account in estimating the superior- 

 ity of the larger grades. We find that: 



Grade Excelling by Excelled by 

 3.25 12.9 < 6.6 % 



3.00 26.5 % 7.0 % 



2.50 40.5 % 3.3 $ 



If instead of taking the sum of the weights of grain 

 and straw as the criterion of yield we take the yield of the 

 strew alone, we arrive at the following: 



The very large or 3.25 grade excelled in 66.7 % of the trials. 

 large " 3.00 89.7 % " " n 



medium " 2.60 " " 93.1 % * n " 



But again we find that the victories of the large grades 

 are much more decisive than those of the small grades, and this 

 must not be forgotten ie estimating the superiority of the 

 larger grades. Examination of the table proves that:-- 



Grade $ excelling by % excelled by 



when excelling. when excelled. 



3.25 19, B 10.8 



3.00 29.6 19.4 



2.50 40.7 4.5 



The above trials include some twenty-nine varieties of 

 wheat. Also, the comparisons have been made on the basis 

 of equal numbers of seed and not between equal bulks or 

 equal weights. 



Grenfell (14) selected plump and shrivelled kernels 

 from the same bulk of grain. They were sown with the plump 



