48 
Bulletin 65. 
by the chemical analyses and also by its subsequent deportment- 
under cultivation. 
§ 101. The analyses of the samples taken at the beginning of 
the experiment may be summarized as follows : 
TABLE XXII.—ANALYSES OF SOIL AT BEGINNING OF EXPERIMENT; 
SOIL, SAMPLES TAKEN 1897. 
Nitrogen. 
Per Cent. 
Potash. 
Per Cent. 
Phosphoric Acid. 
Per Cent. 
Humus. 
Per Cent. 
Phosphoric Acid 
in Humus. Cal¬ 
culated on Soil. 
Per Cent. 
Spring. 
0.0937 
1.495 
0.112 
0.815 
0.0384 
A .... H 
Fall. 
0.0938 
1.528 
0.086 
0.712 
0.0333 
Spring. 
0.0882 
1.003 
0.064 
0.945 
0.0205 
B .... • 
Fall.'.. 
0.1022 
0.978 
0.128 
0.910 
0 0345 
Spring. 
0.0882 
1.443 
0.081 
0.736 
0.0296 
C.... < 
Fall. 
0.1015 
1.457 
0.115 
0.740 
0.0396 
Spring. 
0.0959 
1.443 
0.061 
0.660 
0.0288 
D .... 
Fall. 
0.1083 
1.372 
0.099 
0.846 
0.0294 
( Spring. 
0.1295 
0.876 
0.070 
0.808 
0.0486 
E ... • 
) Fall. 
0.1191 
0.936 
0.138 
1.030 
0 0537 
Spring. 
0.1040 
0.854 
0.054 
0.574 
0.0384 
F*...- 
Fall. 
0.0996 
0.750 * 
0.122 
0.502 
0.0334 
* F is a subsoil corresponding to soil E. 
§ 102. The samples, “ Spring ” and “ Fall,” represented in the 
above table were not taken by the same person, nor were they taken 
so nearly from the same spot that they can be considered as dupli¬ 
cates, still the agreement throughout is as close as can be expected, 
except in the case of the phosphoric acid. The anatyses were made 
by the same person, so that the personal equation is eliminated, but 
the differences in the phosphoric acid are great, varying from 60 to 
126 per cent, of the lower percentage found. It is possible that this 
variation between the spring and fall samples may be in the 
sampling, either in the field or in the laboratory, but every care 
was exercised to get this entirely correct. Duplicate analyses were 
made on most of these samples and good agreement was obtained, so 
that after making every allowance for errors in the analytical work 
and in the sampling there is a difference in favor of the samples 
taken in the fall. That the whole of the phosphoric acid present 
went into solution, there can be no doubt. We have examined the 
insoluble residues obtained from these digestions and have been un¬ 
able to find any phosphoric acid. I have no explanation to offer. 
