324 HOW CROPS FEED. 
The results were as follows, for 1,000 parts of extract, 
Portion of Total Organic 
aqueous matters and Phosphoric 
extract. dissolved. volatile. Inorganic. acid. 
1 0.535 0.340 0.195 0.0056 
2 0.120 0.057 0.063 0.0082 
3 0.261 0.101 0.160 0.0088 
4 0.203 0.083 0.120 0.0075 
5 0.260 0.082 0.178 0.0069 
6 0.200 0.077 0.123 0.0044 
1.579 0.740 0.839 0.0414 
We see that each successive extraction removed from 
the soil a scarcely diminished quantity of mineral mat- 
ters, including phosphoric acid. In case of a poor soil, 
we should not expect results so striking, as regards quan- 
tity of dissolved matters, but doubtless they would be 
similar in kind. | 
This is shown by the investigations that follow. 
Ulbricht gives ( Vs. St., V., 207) the results of the simi- 
lar treatment of four soils. 1,000 grams of each were 
put in contact with four times as much pure water for 
three days, then two-thirds of the solution was poured off 
for analysis, and replaced by as much pure water; this 
was repeated ten times. Partial analyses were made of 
some of the extracts thus obtained ; we subjoin the pub- 
lished results : 
Dissolved by 40,000,000 parts of water from 1,000,000 parts of— 
Loamy Sand from Heinsdorf. 
Ist 2d 3d 4th 7th 10th 
Extract. | Extract. |Extract.| Extract. | Extract. | Extract. 
PI ey acd ony see 3014 15 15 8 4 
OG: naka kaye ie 34 14 2 18 11 
BAG ibe 5 5 jeter nn 95 39 38 39 
MGGRERIA. i050 6a 301g 12 10 10 
Phosphoric acid...| trace. 14g 3 3 
Tot... 190° siz | 87 78 
