I74 STORRS AGRICULTURAL EXPERIMENT STATION. 
acre by its percentage of protein. The last two columns of 
the table show the percentage of the yields of dry matter and 
of protein from each plot if the average of the yields from the 
mineral plots be taken as a basis. 
In making the analyses of the samples of these field crops 
tests for nitric acid were made in a considerable number of 
samples, especially those from the plots in which the largest 
quantities of nitrogen in nitric acid and other forms were applied 
-in the fertilizers. The tests were made by treating cold water 
extracts with a sulphuric acid solution of di-phenylamin. ‘The 
deep color of the extract interfered. somewhat with the reac- 
tions and prevented quantitative determinations. But it was. 
estimated that in no instance was the amount of nitric acid 
indicated sufficient to make one per cent. of the total nitrogen 
found in the samples. 
In 1897 the experiments were vitiated by excessive rains 
during the growing season. The nitrogenous fertilizers failed 
to produce results in amount and uniformity of yield such as. 
had been obtained in other years. ‘This may have been due to 
a loss of the materials in which the nitrogen was supplied to 
the soil, these being readily washed out of the soil by heavy 
rains when they are not taken up by the plants. ‘The weights 
of the crops when harvested in 1897 were considerably below 
those of former years, and the general irregularities of the 
experiments indicated that the results asa whole would not 
warrant the usual analyses. In the tables giving the data of 
the experiments, therefore, only the weights of the crops at 
harvest are found for 1897*, and these are so unusually low 
that they are not included in the averages. The results of the 
experiments of 1898 and 1899 appear to be fairly normal. 
EXPERIMENTS WITH CORN. 
When these experiments were begun in 1895 two varieties 
of corn, ‘‘ yellow flint’’ and ‘‘ white flint,’’ were grown. Analy- 
ses of samples of the grain used for seed in the first of the 
experiments, in 1895, showed a difference in the composition 
of the two varieties, the white flint corn having thirteen per 
cent. of protein in the dry matter of the grain, while the yellow 
flint contained only eleven percent. The latter had been grown 
upon poor soil for many years. 
* Except cow pea fodder, of which analyses also were made. 
re” 
