Wright and Heise: Philippine Waters 



147 



erally of the Bender and Hobein type) was introduced into the 

 circulation system, so that all air and gases were dried before 

 they entered the ionization chamber. It was found impossible 



Fig. 2. South-central Luz 



to obtain reliable readings without this precaution. Our results 

 indicated that drying is also necessary at lower temperatures in 

 order to ensure correct results with the type of instrument 



