26 
Table XI. — Effect of salts and moisture content on apparent specific gravity — Contd. 
SOIL NO. 530. 
Check. 
Potassium 
Calcium 
Superphos- 
Ammonium 
Sodium 
Sodium 
sulphate. 
oxid. 
phate. 
sulphate. 
nitrate. 
carbonate. 
Ap- 
Ap- 
Ap- 
Ap- 
Ap- 
Ap- 
Ap- 
Moist- 
parent 
Moist- 
parent 
Moist- 
parent 
Moist- 
parent 
Moist- 
parent 
Moist- 
parent 
Moist- 
parent 
ure 
spe- 
ure 
spe- 
ure 
spe- 
ure 
spe- 
ure 
spe- 
ure 
spe- 
ure 
spe- 
con- 
cific 
con- 
cific 
con- 
cific 
con- 
cific 
con- 
cific 
con- 
cific 
con- 
cific 
tent. 
grav- 
tent. 
grav- 
tent. 
grav- 
tent. 
grav- 
tent. 
grav- 
tent. 
grav- 
tent. 
grav- 
ity. 
ity. 
ity. 
ity. 
ity. 
ity. 
ity. 
Perct. 
Perct. 
Perct. 
Perct. 
Perct. 
Perct. 
Perct. 
3.66 
1.0284 
1.0596 
3.90 
7.14 
1. 0368 
1.0737 
6.78 
8.35 
1.0745 
7.47 
1.0622 
7.47 
1.0500 
8.56 
1.0517 
7.47 
1.0087 
9.98 
1.0886 
11.42 
1.0973 
11.61 
1.1135 
10.50 
1.0851 
11.69 
1.0956 
12.52 
1. 1052 
11.02 
1.0517 
12.66 
1.1096 
14.84 
1. 1289 
14.50 
1.1509 
14.44 
1. 1079 
15.02 
1.1043 
14.87 
1. 1079 
13.88 
1.0394 
16. 4C 
1. 1017 
16.86 
1.1114 
17. IC 
1. 107C 
17.42 
1.0912 
17.33 
1.0605 
18.00 
1.0693 
16.76 
1.0079 
19.30 
.9640 
21.68 
.9745 
21.60 
.9096 
19.86 
.9447 
20.20 
.8789 
20.31 
.9184 
SOIL NO. 516. 
10.95 
15.14 
18.54 
21.26 
24.13 
0.8035 
.8973 
.8219 
.7403 
14.19 
17.77 
21.16 
23.67 
0.9026 
.9219 
.8140 
.7517 
12.33 
15. 
19.12 
21.71 
.9351 
.8886 
.8035 
13.09 
16.51 
19.11 
22.46 
26.71 .6675 26.11 .6833 24.77 .7210 24.95 .7140 22.21 .7543 22.79 .7552 
0.8859 
.9158 
.8570 
.7781 
11.49 
15.01 
18.22 
21.86 
.9245 
.8982 
.8219 
10.19 
13.98 
17.46 
20.90 
0.8684 
.9236 
.9166 
.8307 
12.18 
15.62 
18.79 
21.25 
23.37 
0.8587 
.9035 
.8833 
.8324 
.7912 
SOIL NO. 428. 
11.23 
15.11 
17.96 
18.50 
21.90 
25.33 
0.7394 
.7464 
.7175 
.6737 
.6403 
12.97 
16.42 
19.10 
21.98 
24.86 
0.7403 
.7342 
.7079 
.6780 
.6377 
14.44 
18.39 
20.00 
22.75 
26.62 
0. 7517 
.7245 
.7079 
13.14 
17.30 
19.50 
22.42 
25.34 
0.7245 
.7166 
.7008 
.6701 
.6623 
14.18 
18.08 
20.76 
23.25 
25.89 
0.8386 
.7657 
.7298 
.6929 
.6666 
In soil No. 573 specific gravity decreases regularly with increase 
in moisture content up to the optimum both in the untreated soil and 
in those treated with salts. The effect of salts is not striking but in 
some cases increases, in others decreases, the apparent specific gravity. 
In soil No. 530 the results are very similar to those obtained in the 
cohesion tests. This type shows an increase in specific gravity up to 
a maximum, above which point it decreases to what has been assumed 
to be the optimum point. Calcium oxid, superphosphate, ammonium 
sulphate, sodium nitrate, and sodium carbonate decrease the specific 
gravity, while potassium sulphate slightly increases it, differing con- 
siderably from their action on the previous soil. 
With soil No. 516 the results are similar to those with No. 530 in 
that the apparent specific gravity increases with increase in moisture 
content to 18.5 per cent, beyond which it decreases to the optimum 
point. All salts affect this soil in the same manner, resulting in an 
increase in apparent specific gravity, sodium carbonate having the 
greatest effect. 
Soil No. 428 shows the same relation between apparent specific 
gravity and moisture content as soils Nos. 516 and 530. The effect 
