AQUEOUS SOLUTIOX OP THE SOIL. 



225 



Loamy Sand from Wahleclorf. 



Loamy ferruirinous Sand from Dahme, containing 4J^ 

 of humus. 



Potash 



Soda 



Lime 



Magnesia 



Phosphoric acid.. 



Total. 



Fine Sandy Loam from Fallvcnberg. 



As Schulze remarks, it is practically impossible to ex- 

 haust a soil completely by water. This liquid will still 

 dissolve something after the most prolonged or frequently 

 renewed action, as not one of the components of the soil 

 is possessed of absolute insolubility, although in a sterile 

 soil the amount of matters taken up would presently be- 

 come what the chemist terms " traces," or might be sueli 

 at the outset. 



The two analyses by Krocker, a and i, p. 314, made 

 on water from the same drain, gatliered at an interval of 

 one month, further show that water, rapidly percolating 

 the soil, continuously finds and takes up new portions of 

 all its ingredients. 



In addition to the simple solution of matters, the soil 

 suffers constantly the chemical changes which have been 

 already noticed, and are expressed by the term weather- 



