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THE AMERICAN NATURALIST [Vol. XLVII 



Table II shows the variation in stature of the corn plants. 

 With respect to ear height it is seen that the addition of the 

 mineral elements, especially if nitrogen was also supplied, ap- 

 parently raised the mean. It will be remembered that ear height 

 is taken to the uppermost ear in two-cared stalks, and a com- 

 parison with Table I indicates that the ear height is significantly 

 greater only where there is a considerable percentage of two- 

 cared stalks, making it very probable that none of the fertilizers 

 influenced in any marked degree the height of the ear on single- 

 eared stalks, or of the lower ear where two were present. 



The differences in variability of ear height so far as they are 

 significant are probably to be referred to the same cause, an in- 

 creased number of two-eared stalks resulting in greater varia- 

 bility, as would be expected. 



TABLE III 



There is little evidence that either of the mineral elements 

 alone or both together increased the stature of the whole plant, 



