12 
tures and time of heating. However, in this work only 100 grams 
were treated with 500 cubic centimeters fifth-normal nitric acid. The 
extraction differed in that the soils were shaken occasionally, for a 
period of 5 hours, and then filtered directly through double filter 
papers. All determinations were made gravimetrically in 100 cubic 
centimeters of this filtrate with the exceptions of iron, which was 
determined volumetrically, and phosphoric acid and titanium, which 
were determined colorimetrically in 25 cubic centimeter portions of 
the original extract. 
SOIL TYPES. 
The types of soil selected for this work were of the widest possi- 
ble range, and represented, in a general way, the normal and ab- 
normal types, both physical and chemical, to be found in the islands. 
The following table gives the chemical analyses of samples as deter- 
mined with hydrochloric acid of specific gravity 1.115: 
Chemical analyses of soils used. 
Soil 
No. 
74. 
Soil 
No. 
164. 
Soil 
No. 
Soil 
No. 
292. 
SoU 
No. 
290. 
Soil 
No. 
405. 
Soil 
No. 
416. 
Soil 
No. 
417. 
Soil 
No. 
406. 
Soil 
No. 
428. 
Soil 
No. 
426. 
Soil 
No. 
448. 
Moisture (H 2 0) 
Volatile matter 
Insoluble matter 
Iron oxid (Fe 2 3 ) 
Alumina (AI2O3) 
Titanium oxid (Ti0 2 ) 
Manganese oxid (Mn 3 04) . . . 
Lime(CaO) 
Magnesia (MgO) 
Potash (K 2 0) 
Soda(Na 2 0) 
Sulphuric acid (SO3) 
Phosphoric acid (P 2 Os) 
P.ct 
25.46 
13.08 
32.69 
10.13 
12.59 
.13 
2.63 
1.09 
.14 
.34 
.22 
1.02 
P.ct 
1.22 
3.56 
48.17 
30.58 
3.05 
1.72 
.10 
.12 
1.22 
.48 
1.46 
.44 
.08 
P.ct 
5.36 
16.78 
31.67 
18.60 
14.67 
.68 
9.21 
1.32 
.52 
.79 
.38 
.15 
.20 
P.ct. 
7.65 
8.42 
38.49 
16.63 
12.85 
2.00 
.24 
1.84 
8.71 
.39 
1.36 
.08 
.57 
P.ct. 
8.44 
15.80 
40.02 
16.41 
14.11 
1.50 
.30 
.77 
1.30 
.17 
.42 
.10 
.27 
P.ct 
8.02 
12.50 
39.12 
15.24 
20.54 
2.40 
.15 
.86 
.99 
.20 
.48 
.33 
.44 
P.ct. 
6.17 
17.73 
36.09 
13.20 
20.39 
1.60 
3.84 
.33 
.44 
.39 
.59 
.35 
.20 
P.ct. 
16.26 
17.53 
30.92 
11.24 
19.38 
1.40 
2.85 
.21 
.36 
.45 
.36 
.43 
P.ct. 
10.34 
17.73 
37.31 
10.92 
20.20 
1.80 
.06 
.48 
.67 
.20 
.48 
.30 
.48 
P.ct 
14.94 
22.24 
34.99 
8.24 
10.73 
3.20 
.20 
1.91 
2.24 
.24 
1.40 
.45 
.22 
P.ct 
10.47 
18.28 
24.80 
22.52 
19.10 
3.80 
.22 
.15 
.44 
.28 
.74 
.39 
.19 
P.ct. 
16.00 
25.58 
15.10 
19.20 
16.64 
4.20 
.06 
.50 
No. 74 is a yellowish-brown soil from Waimea, Hawaii, of sandy 
silt texture, with an abnormally low clay content, and maintains a 
very loose, open structure. 
No. 16T4 represents a peculiar type of soil more or less scattered 
over the islands, which upon absolute analysis shows about 20 per 
cent of titanium oxid. It is high in iron and aluminum, and also 
contains a larger percentage of ferrous iron than any of the soils 
examined heretofore. It has a high specific gravity, bluish-gray 
color, packs quite closely, has a " clayey silt" texture, and contains 
an abnormally low content of moisture and organic matter. 
No. 9 is a sample of the highly manganiferous type found in the 
Wahiawa district on Oahu. It has a chocolate-brown color, a sandy 
silt texture, and maintains an excellent mechanical condition, thus 
permitting good aeration. 
No. 292 represents the type of soil occurring in the lowlands in 
and about Honolulu now being used for bananas, rice, and truck 
farming. It has a sandy texture, grayish-brown color, and abnor- 
mally high magnesia content. 
