288 
Journal of Agricultural Research 
Vol. I, No. 4 
POTASH CONTENT OP THE WHOLE WHEAT AND OP THE ASH 
The potash in the wheat, like the total ash, was seemingly influenced 
more by climatic and seasonal variations than by the soil, so that the 
amount of potash in all samples rose or fell in practically the same pro¬ 
portion as the amount of total ash, and the percentage of potash in the 
ash—about 30 per cent—remained very nearly constant for all localities, 
soils, and seasons included in the experiment. This is further shown by 
the similarity of the averages, whether by locality (see Table III), with 
averages of 29, 30, and 30 per cent for California, Kansas, and Maryland, 
respectively, or by soils (see Table IV) with averages of 30, 29, and 29 
per cent, respectively. 
correlation between physicae properties and chemicae 
CONSTITUENTS 
Although the relationship or interdependence between the physical 
properties and chemical constituents does not show in these results as 
markedly as might be expected, such relationships may be distinctly 
traced in some of the constituents. Thus, as has often been pointed out 
by others, a distinct correlation exists between the protein content and 
the physical appearance or between the protein content and the weight 
of 1,000 grains, high protein being more or less parallel with flintiness 
and with lightness of grains. The table of averages (see Table III) shows 
that the Kansas samples, containing 18.83 P er cent of protein, averaged 
99 per cent of flinty grains and weighed at the rate of 19.1 grams for 
1,000 grains, while the Maryland samples, containing 12.43 per cent of 
protein, averaged but 35 per cent of flinty kernels and weighed 25.6 grams 
for 1,000 grains, and the California samples, containing 13.11 per cent of 
protein, averaged 86 per cent of flinty grains and weighed as high as 30.2 
grams for 1,000 grains. The results in Table IV show a similar tendency 
in these respects, the samples grown on Maryland soils in the three locali¬ 
ties being somewhat richer in protein and having at the same time more 
flinty kernels and weighing less for each i ; ooo grains than the samples 
grown on California or Kansas soils. The differences in this case, how¬ 
ever, were very much less notable than those due to climatic variations. 
(See Table III.) There was a less noticeable parallelism between the 
fiber and pentosans, a high fiber content, as a rule, being accompanied by 
a high pentosan content, and vice versa. The California-grown samples, 
which were the heaviest, contained the smallest amount of fiber and pen¬ 
tosans, while the Kansas samples, which were the lightest, contained the 
greatest amount. 
The fact that the ash and protein contents were low in the California- 
grown samples and high in the Kansas-grown samples might lead one to 
expect that the ash was a function of the protein content. This is not 
borne out by an examination of Table III, where it is seen that the ash 
