434 
became covered with a growth of alum crystals which were colored 
yellow by a small amount of ferric salt. In appearance the crystals 
deceptively resembled those of sulphur, and there is no doubt but that 
many statements concerning the large amount of sulphur in volcanic 
craters would be more accurate if iron salts were taken into consideration. 
The negative results obtained from this rock make it appear probable 
that there are no radio-active salts in solution in the water. 
Water No. 1 was of a decidedly green color and when brought into 
the laboratory was comparatively free from sediment; No. 2 was of a 
greenish-yellow and was partially filled with a sediment which largely 
consisted of gypsum. No odor of hydrogen sulphide or of sulphur 
dioxide was perceptible in either water and microscopic examination 
revealed no organized matter. 
Qualitative analysis showed the presence of ferrous and ferric iron, 
ammonium, aluminum, phosphoric acid, magnesium, calcium, potassium, 
sulphuric and chlor-ions, barium and strontium (spectroscopic determina- 
tion only). No cesium or rubidium could be detected. 
The quantitative analysis is as follows: 
Quantitative analyses of waters from the crater of Taal Volcano. 
[Figures express grams per 100 ce, of the water. ] 
No. 1. No. 2. 
Color Green. Yellow. 
Sp. gr. at 15° C. 1. 1062 1. 1763 
Acidity 1.28 N. 2.08 N. 
Acidity calc. as H,SO, 6.14% 10. 28% 
Calc. as HCl 4. 65% 7.57% 
Total solids (filtered water), by 
heating to 110° for 6 hrs. 15. 8678 25. 7235 
Total solids (unfiltered water), 
by same method 15, 9312 30. 3175 
(Sediment difference ) . 0634 4, 5940 
SO, 4. 1303 5, 6768 
Cl 6. 3148 11. 2760 
Fe (total) 1. 031 pire aie 
Fe . 7150 1, 3250 
Fe . 3160 . 386 
Al 1. 1892 3. 485 
Na 1. 7217 . 9343 
PO, . 0273 . 0391 
Ca . 0934 . 1042 
Mg . 9432 1. 8210 
K . 0418 . 0514 
The following is the analysis made by José Centeno* in 1885, calculated 
1 José Centeno, “Hstudio Geoldégico del Volcén de Taal” 21, 22. Also in Becker 
“Reports on Geology of the Philippine Islands”, p. 49. Extracts from 2/st Annual 
Report U. 8. Geol. Survey (1899-1900), Part ITI. 
ie a 
