814 TTO\r rnoPS TEKt). 



Krocker has also published analyses of drain- waters 

 collected in summer from poorer soils. He obtained 



Total, 42.1 42.5 aS.t 15.3 25.8 24.7 



Krocker remarks {Joiir.far Praht. Chem., 60-466) that 

 phosphoric acid could be detected in all these waters, 

 though its quantity was too small for estimation. 



a and b are analyses of Avater from the same drains — a 

 gatliered April 1st, and h May 1st, 1853 ; c is from an ad- 

 joining field ; d, from a field whei-e the drains run con- 

 stantly, where, accordingly, the drain-water is mixed with 

 spring water ; e and f are of water running from the sur- 

 face of a field and gathered in the furroAvs. 



Lysimeter-Water, — Entirely similar results Avere ob- 

 tained by Zoller in the analysis of Avater AA^hich was col- 

 lected in the Lysimeter of Fraas. The lysimeter * con- 

 sists of a Aessel Avith A^ertical sides and open above, the 

 upper part of AA'hich 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 AVater. 

 The vessel is imbedded in the ground to Avithin 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, Avhile 

 the water AA^hich percolates tiie soil gathers in the reservoir 



• Measurer of solution. 



