Nov. so, 1916 Determination of Hygroscopic Coefficients of Soils 
347 
scopic coefficients. In the fourth column are shown the hygroscopic 
coefficients calculated from the maximum water capacities by the 
Briggs-Shantz formula, and in the last the differences between these and 
the directly determined values. While with about half the soils there is 
a fair agreement, in the case of the others the divergence is so wide 
that the’calculated values would be quite misleading as to the relative 
hygroscopicity. 
Tabi^ II .—Concordance of the determined hygroscopic coefficient with that calculated by 
the Briggs-Shantz formula from the maximum water capacity in the case of California 
soils reported by Loughridge 
Soil No. 
Maximum 
water 
capacity. 
Hygroscopi 
Deter¬ 
mined. 
c coefficient. 
Calculated.® 
Departure. 
6.. 
54-9 
14.53 
7 - 93 
-6. 6o* 
863... . 
68.8 
14. 20 
11. 18 
-3.02 
188. 
59-6 
13 - 70 
9.03 
-4.67 
643 .. • 
64. 6 
I 3 - 5 I 
10. 20 
“ 3 - 31 
1679 . 
46. 0 
II. 98 
S- «S 
-6. 13 
68 ... 
59-8 
II. I9 
9. 08 
—2. 11 
676. 
54-4 
II, II 
7. 82 
“ 3 - 2 9 
77 .. 
68.9 
10.38 
II. 21 
• 83 
5 2 - 4 
10. 32 
7-35 
-2.97 
67 .'.. 
5 °- 7 
10. 26 
6-95 
- 3 - 3 1 
789. 
57-8 
9 - 74 
8 . 6 l 
-1.13 
$06 ... 
55-6 
9. 26 
8. 10 
— 1. 16 
8 . 
52.1 
9. 18 
7. 28 
— 1. 90 
82.3 
9. 18 
14-34 
5. 16 
63-5 
7 - 52 
9 - 9 S 
2-43 
1678. 
34-2 
6. 41 
' 3-09 
“ 3 - 32 
m 3 - . 
5 2 - 3 
6. 00 
7*32 
1. 32 
ms. 
S 3-8 
5 - 93 
7. 68 
75 
1284. 
58.8 
5.81 
8. 85 
3 -<H 
168. 
38.7 
5-49 
4 - 14 
-i- 35 
1167.. 
41.7 
5-38 
4.84 
“ • 54 
1645. 
58* 4 
5 - 2 7 
8.7s 
3-48 
4 . • ■ ■'. 
46. 6 
5-18 
5-99 
.81 
5 2 * 4 
5-14 
7 - 3 S 
2. 21 
1647. 
49.9 
5-14 
6. 76 
— 1. 62 
42. 0 
5.10 
4.91 
- - i 9 
1663. 
48. 0 
5.06 
6. 32 
I. 26 i 
586 .., . 
47*3 
4.86 
6. 15 
1. 29 
1655. 
44-3 
4. 20 
5 - 45 
2 S 
XI 59 . 
37-4 
4. 00 
3- 84 
— . 10 
i °55 .. 
3 6 -9 
3. 62 
3 - 7 2 
. 10 
1197. 
34-8 
3-48 
3 - 2 3 
- *25 
1148. 
. 41. s 
3 - 43 
4. 80 
I- 37 
5 1 . 
49-5 
3 - 17 
6. 70 
3 - 53 
9 ... 
58-9 
2. 63 
8. 87 
6. 24 
13°. 
40. 7 
2. 30 
4. 61 
2.31 
1281. 
37-9 
1. 98 
3 - 95 
1.97 
1147 . 
28. 7 
1. 84 
I. 80 
- .04. 
1 595 .. . 
2 9 - 7 
1. i 5 
2. 04 
.89 
233 . 
23. 0 
• 79 
•47 
- .3 2. 
a By the Briggs-Shantz formula: Hygroscopic coefficient “(maximum water capacity—21) X0.234. 
