58 ROYAL SOCIETY OF CANADA 
present together all the data respecting each class of plants obtained 
throughout the three seasons of trial, this plan allowing a more ready 
review of the tabulated figures representing weights and percentages and 
the conclusions drawn therefrom. 
CLOVER. 
Variety used, Mammoth Red; culture employed, ‘ Trifolium pra- 
tense.’ Table I. presents the data of experiments carried on in 1897. 
In comparing the total weights obtained, it will be observed that the 
crops, both from the soil-inoculated and seed-inoculated plants, exceeded 
that grown without the aid of Nitragin. This increase, it will further be 
seen, is due chiefly, though not entirely, to the greater development of 
the root-system in the treated plants. In this respect our results fall into 
line with those of Dr. Voelcker, an English agricultural chemist, who 
has remarked from his experiments a decided effect from Nitragin upon 
root development. Since the principal object in using this preparation 
is the assimilation of nitrogen other than that present in the nitrogenous 
compounds of the soil, the feature of most interest throughout these data 
will be the amount of this element found in the various trials. An inspec- 
tion of the foregoing table reveals the fact that the crops of clover both 
from inoculated seed and inoculated soil possess more nitrogen than that 
in the untreated. In this connection it is worthy of note that the roots 
contain an amount equal to at least two-thirds of that present in the foli- 
age. In this experiment seed-inoculation gave the best results as to weight 
of crop and nitrogen. 
Table IT. shows the percentage composition and the nitrogen of the 
fresh material, and gives the data calculated on the water-free substance. 
These figures allow us to draw conclusions as to relative richness of 
the green plant and its “dry matter” in nitrogen. It is to be observed 
that, as a rule, slightly larger percentages were found in the inoculated 
plants. These increases, however, are not sufficient to account for the 
comparatively large excess of nitrogen in the crops treated with Nitragin 
over that in the untreated crop ; we, therefore, conclude that the benefit 
from Nitragin arises rather from a more luxuriant growth of the clover 
than from any marked increase in the percentage of nitrogen in either 
roots or foliage. 
The trials with clover during the seasons of 1898 and 1899 were 
conducted on plots in the manner already outlined. The method of 
seed inoculation only was used, and the crop (including roots) from 
the treated and untreated plants taken from the adjacent areas of 
equal size. “Mammoth Red” was the clover sown, and the culture 
“Trifolium pratense” used as in the previous year. Since, as has been 
shown, the amount of nitrogen will be approximately in proportion to 
