476 
Journal of Agricultural Research 
Vol. XXIV, No. 6 
thrown down in considerable quantity by ammonia. Lime magnesia 
was also thrown down by ammonium carbonate. 
Lime in the water was determined by the following method: To loo cc. 
of the water a few drops of HCl were added to dissolve anything which 
might be held in suspension, and then 5 gm. of ammonium chlorid. 
Ammonium hydroxid was added in sufficient quantity to make the solu¬ 
tion strongly alkaline and acetic acid to make the solution just slightly 
acid. After boiling, the iron, aluminum, and phosphorus were filtered off 
and the precipitate carefully washed. To the boiling filtrate and wash¬ 
ings, 10 cc. of 10 per cent solution of ammonium oxalate w’^ere added, then 
dilute ammonia until the solution was slightly alkaline. After digestion 
the solution was allowed to stand over night, then filtered on ash-free 
filter papers and washed with hot w^ater. 
The precipitate on the filter paper was then dissolved with 10 per cent 
solution of sulphuric acid. Next, 2 cc. more of H2SO4 was added, plus 
enough water to bring the volume to 200 cc. The solution was then 
warmed and titrated with normal solution of potassium permonga- 
nate. Lime was calculated on the basis of i cc. of solution (.0028 gm. 
of CaO). The results of these tests are given in Table I. 
TESTS WITH CARBONIC ACID 
Carbonic acid was* next suspected as being the solvent. A quantity of 
distilled water was saturated with pure carbonic acid. Weighed fi'ag- 
ments of tile of approximately the same shape and size and from which all 
loose particles were removed were placed in 500 cc. bottles and 475 cc. 
of the various waters added. The bottles were then tightly corked, 
placed in a revolving shaker machine and agitated 24 hours intermit¬ 
tently for 3 days. Duplicate samples of each were run. It was at¬ 
tempted to determine the solubility of the tile by determining the amount 
of lime originally in the water and in the sample run. It was found that 
lime was actually thrown out of solution from the waters taken from the 
bog and that the carbonated water did not contain nearly as much lime 
as did the distilled water. The results are shown in Table I. 
Table 1 .—Grams of CaO per liter, in marginal and hog waters in their original condition, 
as collected in February, and in these and in distilled and carbonated waters after agitat¬ 
ing j days with similar pieces of new tile 
Original water. 
Waters agitated with tile. 
Test No 
Marginal. 
Bog. 
Distilled. 
Carbonated. 
Marginal. 
Bog. 
Gms 
Gms 
Gms 
Gms 
Gms 
Gms 
0. 0896 
0. 0854 
0. 2156 
0. 1120 
0. 0651 
0. 0945 
. 1120 
. 0857 
. 2226 
. 0476 
. 0588 
.0736 
. 1106 
.0868 
• 136s 
Broken. 
•0525 
• 0357 
\J 
078 il 
1 
• 
T OoS 
Average. 
• 1033 
. 0826 
. 1918 
.0798 
• 0583 
i . 0686 
In the agitated waters it will be noted that some of the tests in a series 
show a marked variation from others in the same series. This was 
attributed to the fact that the samples of tile were probably far from 
uniform. 
