280 



BACON. 



Very slightly active. 



29. Black sand from Ambos Camarines. Exact locality unknown. 



Time, 

 (a. m.) 



11.15 

 12.05 



Volts. 



• 158.7 



154.2 



Volts 

 per hour. 



5.3 



Very slightly active. 



30. Black sand from Agusan River 



Time, 

 (a. m.) 



8.35 



[Bukidnoh near Cagayan) Mindanao. 



Volts 

 per hour. 



Volts. 

 218.9) 

 10.20 207.9J 



Slight activity. 



31. Black sand from bed of Manigui Creek, Agusan Province (Bukidnon), 



Mindanao. 



Time. 



(a. m.) Volts. 



10.25 208.31 



11.45 198.3J 



Slightly active. 



32. Black sand from the stream at the base of Mount Panacion, pueblo of 

 Linabo, Agusan Province. 



6 



Volts 

 per hour. 



7.7 



Volts 

 per hour. 



7.9 



Time. 



(a. m.) Volts. 



11.45 198.31 



1.00 188.4) 



Slightly active. 



These results demonstrate that there is a slight, but rather generally distri- 

 buted radioactivity throughout the Philippine Islands, the waters of Taal Volcano, 

 and some of the sands containing monazite alone showing pronounced phenomena'. 



