AQUEOUS SOLUTION OF THE SOIL. 325 
Loamy Sand from Wahlsdorf. 
Potash............ 23 12 18 6 4 
Soda.............. 26 16 20 16 6 
DON Csi sceis's sareiara ze 116 43 39. 42 48 
Magnesia......... 3614 15 14 12 14 
Phosphoric acid.. vi | 3 4 | 4 | | 
Total......... | 208% | 89 9 | 80 | | 
Loamy ferruginous Sand from Dahme, containing 41g 
of humus, 
Potash........ asiee q 6 7 v 3 
Soda.............. 41 11 26 17 8 
HIM} s cseewrscsces 96 70 55 48 62 
Magnesia.......... 14 10 9 7 8 
Phosphoric acid..] trace. 2 trace. 1 
Total......... 158 99 97 80 
Fine Sandy Loam from Falkenberg. 
Potash............ 1 11 9 9 
S0d8e 5 ssxees sees 47 12 12 8 
Lime....... 47 27 19 18 
Magnesia. “17 8 5 6 
Phosphoric acid.. 3 2 trace. | trace. 
Total......... 129 60 45 at | | 
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 such 
at the outset. 
The two analyses by Krocker, a and 8, p. 314, made. 
on water from the same drain, gathered at an intervai 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- 
