X, A, 1 Heise: Boiler Waters of Iloilo Province 79 



of the work a number of water supplies were found which 

 might be used to advantage, and in order to make the results 

 of this work available the most significant data are tabulated 

 herewith. 



Most of this work was done in the field, for the most part 

 in accordance with the methods outlined by Leighton,'^ by whom 

 the sources of error and the accuracy of these methods 

 have been discussed. "Color" is rated in terms of the Hazen * 

 platinum-cobalt standard. The "probable encrustants" were 

 calculated in accordance with the formula given by Dole.* 

 The "classification for boiler use" is more or less arbitrary. 



Although these data are only approximate, they give a fairly 

 good idea of the industrial water supply situation in Iloilo, and 

 indicate that there are a number of sources which will yield 

 good boiler water. 



Some of these waters should be quite suitable for boiler pur- 

 poses without any treatment; most of them could be made into 

 excellent boiler waters by preheating or by inexpensive chemical 

 treatment. It will be noted that the "Jaro" water is one of the 

 worst on the list. The sources listed for the most part are 

 surface supplies; hence, it is possible that change of season 

 might introduce or cause variations in chemical quality. All 

 of the analyses were made in November and December, 1914; 

 that is, after the dry season was well along; hence, another 

 series of analyses should be made, preferably during the rainy 

 season, to determine whether any changes occur great enough 

 to affect the fitness of these waters for boiler purposes. 



' Water Suppl. & Irrig. Papers, U. S. Geol Surv. (1905), No. 151. 



'Am. Chem. Journ. (1892), 12, 300. 



* Water Suppl. & Irrig. Papers, U. S. Geol. Surv. (1910), No. 254, 232. 



