EXPERIMENT STATION BULLETINS. 



511 



In neai'ly every case there was a slight increase in the last determina- 

 tion over the first. None of the changes were very marked and varied in 

 both directions. The total solids vary somewhat similarly as will be 

 seen in Table V under Soil, Nos. 34 and 35. 



PLATE 5. DIFFERENT PARTS OF THE EXTRACTION APPARATUS AND WRENCH 

 AND BAR FOR FASTENING ON THE TOP. A, CYLINDER; B, WIRE GAtJGE ; C, 

 COVER ; D, PERFORATE PLATE ; E, PEDESTAL AND SPOUT ; F, COPPER GASKET. 



Soil. 



This method can be used with all kinds of soils, but it is better adapted 

 to the coarser and more porous soils like the sandy and sandy loam soils 

 than to the finer grained and less porous soils as the clays and clay- 

 loams. 



I 

 Moisture Content and Solution Obtained. 



This method will not give the entire moisture content, nor will any 

 method yet devised give the entire moisture content as it exists in the 

 soil. The moisture content that is necessary for an extraction will de- 

 pend upon the nature of the soil used. If it contains a large amount of 

 organic matter or if the grain size is very small, a larger moisture con- 

 tent is necessary than if the reverse is true. The amount of solution 

 that can be obtained from the soil will depend upon three factors: 



1. Moisture content of the soil. 



2. Kind of soil. 



3. The packing of the soil. 



