A Study of Colorado Wheat 
41 
vitreous appearance, and a higher content of nitrogen. Further, we 
have the fact that kernels of this character are produced in the same 
variety of wheat, in the same field and during the same season along¬ 
side of large, plump, mealy, light-colored, soft kernels, sometimes even 
much lower in their nitrogen content. It would seem evident that these 
results cannot be the result of any climatic conditions, even if we 
narrow this term down to those accidental features which constitute 
weather conditions. We can support this view with data of our own 
collecting. On the other hand, we have our direct observations that 
potassium increased the percentage of yellow-berry, the size of the 
kernel, its plumpness, and imparts to it a lighter color. In the summary 
of Bulletin 243 of Ohio we find this conclusion: ‘Potassium has increas¬ 
ed the proportion of plump kernels, although the yield is the same as when 
nitrogen is applied to the soil and the composition is practically the same 
as that found in the wheat from unfertilized soil.”* I have a few samples 
of Ohio wheats, which fact I owe to the courtesy of the Ohio Station, 
and these samples are so different from our wheats that comparisons 
are scarcely permissible. But one thing is very striking and this is that 
they are strongly affected with yellow-berry, or starchiness, and are 
not comparable with ours in plumpness. I take it that this enhances 
their observation relative to the effects of potassium upon this char¬ 
acteristic of the kernel. As I am almost wholly ignorant of the condi¬ 
tions under which these samples were grown, I would not, if I desired 
to do so, permit myself to judge of the causes of the characteristics of 
these samples further than the author has done. 
THE DIFFERENCE IN COMPOSITION OF FLINTY AND STARCHY 
KERNELS 
The physical differences between the flinty and starchy berries 
are very evident tO' the eye, much more so than ca(n be expressed in 
words. We have stated that such berries differ in composition. The 
annotations in the tables, giving the composition of general samples, 
are intended to suggest an idea of the composition of yellow-berry 
wheat, and the table given herewith is intended to show the differences 
in the composition of these berries grown on our own plots under iden¬ 
tical conditions of climate, including the water supply and known con¬ 
ditions of manuring, the soil being as nearly identical as can be obtain¬ 
ed. The table contains no samples grown with the application of 
nitrogen, because these samples contained no mealy kernels. Analyses 
of such samples will be found in subsequent tables and may also be 
found in the tables of general samples of winter-wheats for 19T4. 
♦ Ohio Bulletin 243, p. 587. 
