XII, C, 4 Brown, Merrill and Yates: Volcano Island 207 
an important effect on the revegetation. Cox ** gives an analy- 
sis of ash thrown out by the eruption of 1911. This analysis 
shows nearly~5 per cent of material readily soluble in water, 
including 0.3 per cent sulphuric anhydride (SO,) and 0.74 per 
cent chlorine. This would indicate that such ash would not form 
soil favorable for plants until after the water-soluble material 
had been leached out to a very considerable extent. 
Shortly after the eruption the surface of the crater lake was 
very much lower than at present and had streams of water flow- 
ing into it. Cox gives an analysis of the water. of one of these 
TABLE III.—Analyses of water of Taal Crater, Lake Bombon, and spring 
at Ambulong. 
{Numbers give parts per million.] 
Roaiege at| Lake Bombon | 
Ambu- (1917). Hot stream 
long at Crater (flowing into} 
Source. ae Reet Ap on ein rater 
Lake | Near | Near | {1917).? ane 
Bombon| Ambu- | Volcano a 
(1917). | long.® | Island.> 
Total solids by evaporation_.-._---.--------- 370.0 | 1,220.0 | 1,540.0 |40,000,0 |...-..------ 
Suecine gravity ut 16°. et ee a bag Bt mah et cea etre 
nelinty 5 his Sees ee ‘ei tee 3 0.0147 N | 0.0069 N 
Wink (Oise et a ee 72.0; 18.0 | 10.0 | 410.0 710.8 
Iron and aluminum oxides Fe20s+AlzO3.___ 2.0 2.8 2.0 MON. 125755 
Hon We); total. 14 0.24 0.14} 135.0 172.0 
Matiganose .222002. 22263 2 Be a we eben $10.0 79.9 
Alnminum (A1) 5 pecd cies sccesiaetnte easy trace phe a ee 86.0 26.1 
Calciom (Ca) 41.0 59.0 64.0 860.0 556.8 
Magnesiunt (My) <.. <<. <. 5228s ea ee 120.0} 400.0 , 50.0 | 2,650.0 909.3 
Sodidin(Nay SA AS ee bee a ea 9, 870.0 2,584.3 
Potematvins £50) ss gee et | en wesc oee 870.0 237.4 
Chlorides (Cl) _.___- 6.1| 410.0 580.0 |18,300.00} 6,024.3 
Bronidus (is)... eee tree Fe a 
Jodidear tt) <2 ee ee ee ee ri ig eke tance iy 
Sulphates (SO«) ae, ve 23.0| 160.0 | 194.0 | 3,300.0 2, 782.0 
Phosphates (P00) 5 ee a a eee eee WG ee 
Normal carbonates (as COs) --..---.-------- 0.0 12.3 980 fs ee eae 
Bieirbonstei:s. 332. 300.0} 190.0 16ikO 3 ee Se 
* Analyzed by J. Gonzales-Nufiez, Bureau of Science, Manila. 
> Heise, G. W., The crater lake of Taal Volcano, Philip. Journ. Sci. A 12 (1917). 
* Cox, A. J., Philip. Journ. Sci. A 6 (1911) 96. 
streams. This analysis is copied in Table III. The water con- 
tained 1.4 per cent of dissolved material, including over 0.6 per 
cent of chlorine, 0.26 per cent of sodium, and 0.27 per cent of 
the sulphate radicle (SO,). The soil from which this high- 
* Cox, A. J., The composition of the fine ejecta and a few other inorganic 
factors of Taal Volcano, Philip. Journ. Sci. A 6 (1911) 93-97. 
