514 
A. B. BEAUMONT 
Leaching has increased the adsorptive capacity of this soil for this dye. 
Theresultsagree with those obtained by the water-vapor-adsorption method. 
Owing to the opposite behavior of the diamine sky-blue with the dif- 
ferent artificially prepared colloidal materials as compared with methy- 
lene blue, it was decided to ascertain the effect of moisture changes on 
The results are given in table 21: 
the capacity of the soils for this dye. 
Difference 
0.050.011 
0.24+0.008 
0.030.009 
0.430.032 
0.02+0.027 
0.46+0.039 
0.10-40.036 
0.050.018 
0.29-+0.035 
0.430.042 
0.06+0.032 
4.01+0.163 
TABLE 21. Errect oF DryIne Sorts oN THEIR ADSORPTION OF DIAMINE SKY-BLUE 
Corrected Milligrams of 
Soil Treatment colorimetric dye adsorbed 
reading Per erany 
of soil 
Continuously moist. .| 52.00+0.7 0.42+0.008 
Air-dried once....... 47 .40+0.5 0.37+0.007 
Dunkirk surface 
Oven-dried once..... 75.40+0.6 0.61+0.003 
lonitedennae one 71.50+1.4 0.58+0.008 
Continuously moist..| 49.75+0.4 0.78+0.026 
Air-dried once....... 73.10+0.8 1.21+0.018 
Clyde surface 
Oven-dried once..... 71.75+1.0 1.19+0.020 
lonited eee 45.60+0.8 0.73+0.034 
Continuously moist..) 49.25+2.0 4.16+0.035 
Air-dried once....... 56.10+0.6 4.26+0.010 
Dunkirk subsoil 
Oven-dried once..... 60.25+1.2 4.31+0.015 
onitedtersi ee sneer 42.50+1.2 4.02+0.030 
Continuously moist..} 48.25+0.9 3.81+40.035 
Air-dried once....... 76.00+1.6 4.24+0.025 
Vergennes subsoil 
Oven-dried once..... 70.40+0.7 4.18+0.020 
lenited spe eee 11.95+0.3 0.17+0.150 
The effect of air-drying once was to decrease the adsorption by the 
Dunkirk surface soil and to increase it with the other soils. 
As between 
