314 HOW CROPS FEED. 
Krocker has also published analyses of drain-waters 
collected in summer from poorer soils. He obtained 
IN 100,000 PARTS: 
a b c d é = 
Organic matters, 2.5 2.4 1.6 0.6 6.3 5.6 
Carbonate of lime, 8.4 8.4 12.7% "9 ye | 8.4 
Sulphate of lime, 20.8 21.0 11.4 Att a %.2 
Nitrate of lime, 0.2 0.2 0.1 0.2 0.2 0.2 
Carbonate of magnesia, 7.0 6.9 4.7 2.4 2.7 1.6 
Carbonate of iron, 0.4 0.4 0.4 0.2 0.2 0.1 
Potash, 0.2 0.2 0.2 9.2 0.4 0.6 
Soda, 1.1 1.5 1.3 1.0 0.5 0.4 
Chloride of sodium, 0.8 0.8 0.7 0.3 0.1 0.1 
Silica, 0.7 0.7 0.6 0.5 0.6 0.5 
Total, 42.1 42.5 33.7 15.3 25.8 24.7 
Krocker remarks (Jour. fiir Prakt. Chem., 60-466) that 
phosphoric acid could bé detected in all these waters, 
though its quantity was too small for estimation. 
aand 6 are analyses of water from the same drains—a 
gathered April Ist, and 6 May Ist, 1858; ¢ is from an ad- 
joining field; d, froma field where the drains run con- 
stantly, where, accordingly, the drain-water is mixed with 
spring water; e¢ and fare of water running from the sur- 
face of a field and gathered in the furrows. 
Lysimeter-W ater.— Entirely similar results were ob- 
tained by Zoller in the analysis of water which was col- 
lected in the Lysimeter of Fraas. The lysimeter* con- 
sists of a vessel with vertical sides and open above, the 
upper part of which contains a layer of soil (in these ex- 
periments 6 inches deep) supported by a perforated shelf, 
while below is a reservoir for the reception of water. 
The vessel is imbedded in the ground to within an inch of 
its upper edge, and is then filled from the diaphragm up 
with soil. In this condition it remains, the soil in it being 
exposed to the same influences as that of the field, while 
the water which percolates the soil gathers in the reseryoir 
* Measurer of solution, 
