262 The Philippine Journal of Science 1922 
Rock, sand, and gravel.—I saw no good quartz sand in,Samar. 
It is true that sand occurs, but the grains are angular and feld- 
spathic. The fact that the concrete street at Catubig contains 
igneous pebbles and bowlders has been stated. That there are 
no deposits of good sand and gravel is not surprising when one 
considers the nature of the country rock and the history of the 
island. Igneous rock for road metal is difficult to obtain. 
The rock, sand, and gravel used on the roads of Samar in 
1920, according to an official report, amounted to 8,474.57 cubic 
meters, costing 24,963.22 pesos. The coralline limestone cost 
5 pesos per cubic meter, and gravel as high as 7 pesos per cubic 
meter, while the lowest figure was 1 peso per unit for coral. 
For purposes of comparison Table 2 is given. 
TABLE 2.—Rock, sand, and gravel used in the Philippines during 1920. 
‘ Average 
Locality. Amount. | Cost. — 
meter. 
cu. Mm. Pesos. Pesos. 
ne as a 65, 525.05 | 94,781.78 1.45 
oe SSIS Na SSS RE SCRE 9 Sate ee 10,342. 72 | 17,948.13 | 1.98 
Rizal RS Pee gg CE Se ie ee 9, 947.00 | 28,348.80} 2.85 
Gammaies SEIS Me. ree ese T= SSeo 8,474.57 | 24,968.22 | 2.95 
Pamipesige - <<: 22-3 Ge ____| 6,116.62 | 27,740.00} 4.58 
Clay—A sample of clay from near Matuguinao, at a place 
locally called “Fairy Land,” shows the following: 
TABLE 3.—Analysis of clay sample from Matuguinao.* 
Per cent. 
Loss on ignition 47.50 
Silica, SiO, 26.37 
Ferric oxide, FeO; 10.64 
Alumina, Al.0; 13.20 
Lime, CaO 0.21 
Magnesia, MgO 1.57 
Potassium oxide, K.0 0.21 
Sodium oxide, Na.O 0.49 
®, Analysis by R. H. Aguilar, Bureau of Science. 
This probably is a residual clay, low in silica and relatively 
high in iron. It is plastic, but would not make a satisfactory 
china clay; at best it would yield only an inferior building prick. 
I saw no deposit of good clay. 
Artesian water—In 1909, George I. Adams, geologist in the 
Bureau of Science, submitted a report on conditions governing 
