28 



Morris J. Blish 



Soil 

 Number 



3270 



3288 



3399 



3324 



3289 



3272 



3344 



3271 



3326 



3421^ 



3400 



3325 



3439 



3361 



3438 



3401 



3360 



3362 



3380 



3440 



3359 



3381 



3306 



3379 



3420 



3308 



3421 



3402 



3307 



3382 



3441 



Area 



Lincoln 



Lincoln 



Weeping Water 



Lincoln 



Lincoln 



Lincoln 



Lincoln 



Lincoln 



Lincoln 



Weeping Water 

 Weeping Water 



Lincoln 



Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 

 Weeping Water 



Lincoln 



Weeping Water 

 Weeping Water 



Lincoln 



Weeping Water 

 Weeping Water 



Lincoln 



Weeping Water 

 Weeping Water 



Field 



Depth 



Humus, 

 Per Cent 



.09 

 .08 



•IS 

 .12 



•05 

 •05 

 .09 

 .04 

 .06 

 .04 

 .11 

 .09 

 .09 

 .06 



Rank 



155 

 159 

 134 

 145 

 170 

 171 

 156 

 175 

 165 

 176 

 148 

 157 

 158 

 166 



The humus extracts from the soils of the transition series gave 

 better results when examined colorimetrically than did the soils 

 themselves. This, of course, is due to the fact that in the ex- 

 tracts only humus is present ; all other foreign matter which 

 would affect the color has been eliminated. The solutions were 

 first examined simply by placing the containers before a white 

 background, and estimating the humus content by comparison 

 with a known standard. An attempt w^as made, as was done in 

 the case of the soil samples in the porcelain dishes, to arrange all 

 of the solutions in the order of depth of color, beginning with the 

 lightest one. They were then examined in the colorimeter, as 

 previously described. The following table shows the results of 

 both operations, and it is readily seen that the solutions may be 



138 



