
FIELD EXPERIMENTS WITH FERTILIZERS. 175 
One object of the experiments was to determine whether the 
two varieties, which differed so much in composition at the 
beginning of the experiments, would still show the same differ- 
ence after they had been grown for a period of years under the 
same conditions regarding methods of cultivation, kinds and 
amounts of fertilizer used, etc. For three years the experi- 
ments with these two varieties of corn were carried on, seed 
taken from the crop on each section in one year being saved 
for planting on the same section the following year. To 
prevent, if possible, a crossing of the varieties that might 
follow if they were grown on adjoining sections, the yellow 
flint corn was grown on the series of sections at the north end 
of the plots (Series A), and the white flint on the series of sections 
at the south end (Series F), the two series being about 175 feet 
apart. Inspite of this separation a slight amount of mixing or 
crossing occurred during the first year (1895). Care was taken, 
however, in saving the seed for the following year, to select 
that which was believed to be unmixed. In 1896 the yellow 
flint corn, which was naturally somewhat slower than the white 
flint in reaching maturity, was planted a week later than the 
white flint, so that the blossoming of the two varieties might 
occur at different periods. In that year mixing or crossing of 
the varieties was apparently prevented. The seed from the 
experiments of 1896 was planted as usual in 1897, but in the 
wet, cool season of that year the yellow flint corn failed to 
mature sufficiently to warrant the use of the seed for planting 
in 1898; and as it was found impossible to secure more seed 
of the same variety from the grower who furnished in 1895 the 
seed used in the first of these experiments, the use of the yellow 
flint corn was discontinued in 1898, and since that time, as will 
be explained in a later paragraph, only white flint corn has 
been used. 
The results of the experiments for 1895 and 1896 may be 
found in the Reports of the Station for those years. The 
results of the 1897 experiments are incorporated with those of 
1898 and 1899 in the present article. As already explained, 
the crops grown in the experiments of 1897 were not analyzed, 
only the weights of the crops at harvest being given in the fol- 
lowing tables; and these are so irregular that they are not 
