AQUEOUS SOLUTION OF THE SOIL. 325 
Loamy Sand from Wahlsdorf. 
PS ea 23 12 13 tbs) 4 
apis ot ect rt. 26 16 20 16 6 
MEY, oi oe 116 43 39 42 48 
Marnesia......... 0614 15 14 12 14 
Phosphoric acid.. ¥ 3 | + | + | 
Uo) ) 20814 89 | 90 80 
Loamy ferruginous Sand from Dahme, containing 414 
of humus. 
in), ae 7 6 z 7 3 
OS ae Pa 41 11 26 17 8 
PTGS xi piors'ain oc « 96 70 55 48 62 
Magnesia... ....... 14 10 9 7 8 
Phosphoric acid..| trace. | 2 | trace. 1 
ital. tsi 2. 158 99 | 97 80 | 
Fine Sandy Loam from Falkenberg. 
BORING. ag ven as == 15 11 9 9 
BOOM oi ee se be. 47 12 12 8 
i ee Pee 47 27 19 18 
DEAS TNORIAS esas eno 17 8 5 
Phosphoric acid.. 3 2 trace. | trace. | 
Metals oy. 129 60 45 41 | | 
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 6, 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- 
