94 



SOILS. 



division, based upon the doubling of grain-sizes instead of 

 current-velocities, has been adopted by Prof. Milton Whitney, 

 of the U. S. Department of Agriculture, and others. 



TABLE OF DIAMETERS AND HYDRAULIC VALUES OF SEDIMENTS. 



Results of sncli analyses. A tabular presentation of the re- 

 sults of analy^t-s made in accordance with the above plan will 

 give- a good idea of the differences between the various grades 

 of soils recogni/ed in farm practice, to any one accustomed to 

 the study of figures. Hut a much mon- satisfactory sh. .wing- 

 is made by placing the several grain-sixes -egregated. into 

 small vials or tubes of identical diameter and placing them in 

 parallel series alongside of rarli other. 1 The curves firmed 

 by the surfaces of the -everal sediment-columns in each scries 

 show to the eye very strikingly the relations of the several 

 grades of s, ,jk to each other, and suggest at once that while 

 gentle slopes or gently undulating curves belong to soils of 

 intermediate, loamy character, steep grades and xig/ags show 

 soils of extreme types. This is exemplified in the subjoined 

 Figures : 



1 Convenient stands for this purpose, ii-i-.l liy the writer since 1872, may be cut 

 from I .-shaped moldings of wood. MH h as can In- leadily ordered from any 

 planing mill. The vials can be cemented, wired or tied. 



