16 
SIR J. B. LA WES ARB PROFESSOR J. H. GILBERT ON THE 
Table VI.—^Percentages of Nitrogen in tbe fine sifted surface soils (9 inches deep), 
reckoned as dry at 100° C., at different periods. Samples collected July 26-31, 
1882 ; July 17-26, 1883 ; July 29-August 14, 1885. 
1882. 
1883. 
1885. 
Mean. 
Wheat-fallow land. 
IMeans on individnal .samples. 
Means on mixtures of indiwdual samples 
Per cent. 
Per cent. 
01044 
01026 
Per cent. 
01006 
01035 
Per cent. 
01025 
01031 
General means. 
01035 
01021 
01028 
Trifolium repens land. 
Means on individnal samples. 
Means on mixtures of individual samples 
01149 
01I3I 
01131 
01125 
01269 
01268 
01183 
01175 
General means. 
01140 
01128 
01269 
01179 
Vioia safiva land. 
Mean on individual samples. 
Mean on mixture of individual samples . 
01203 
01178 
01203 
01178 
General mean. 
01191 
01191 
Melilotus leucantha land. 
■ 
Means on individual samples. 
Means on mixtures of individual samples 
01095 
01123 
01122 
01179 
01109 
01151 
General means. 
01109 
. . 
01151 
01130 
1 Medicago saiiva land. 
1 
Mean on individual samples. 
Mean on mixture of individual samples . 
•• 
01214 
01224 
01214 
01224 
1 
General mean. 
01219 
01219 
It is seen that even the fallow-wheat soils show slightly higher percentages of 
nitrogen in the autumns of 1883 and 1885 than in March, 1881 ; but the later 
samples were all taken from the end of the field, the samples from which showed 
somewhat higher percentages than the others even in 1881 ; and, as the figures show, 
