294 



The Philippine Journal of Science 



which work was done this year: Noso, Aritao, Bambang, Ba- 

 yombong, Solano, Bagabag, Salinas, and San Luis, Nueve Viz- 

 caya; Amdangle, Banaue, Sapao, Aoua, and Monhuyhuy, in 

 Ifugao, Mountain Province; and Loo, Buguias, Lutab, Daklan 

 Ambuklao, and Baguio in Benguet, Mountain Province. 



In addition to the regular equipment used for the determina- 



Fig. 1. A part of northern Luzon. 



tion of radioactivity, we took with us a small chemical field 

 laboratory, modified to meet the unusually severe conditions of 

 mountain travel. The use of this laboratory not only enabled 

 us to obtain data of interest in the study of radioactivity, but 

 it was also of definite value in furthering the field survey 4 of 

 Philippine water supplies now carried on by the Bureau of 

 Science. 



4 Heise, G. W., Water supplies in the Philippine Islands, II, ibid. (1915), 

 10, 137. 



