JOSEPH L. MCCARTHY ^04 



operation and the effect on the oysters, isn't that the 

 point they were trying to prove? In other words, what 

 is the point of the interference issue when the Federal- 

 State report indicated when the mills were not in operation 

 evidently there weren't these interfering elements there 

 and they got zero or close to zero on Pearl-Benson? 



PROFESSOR MCCARTHY: If the method was 

 carried out approximately in accordance with the descrip- 

 tion that we made, I think our conclusion is that what is 

 measured is approximately the concentration of sulfite 

 spent liquor, provided that such interfering substances 

 are not present and within the precisions that I recited 

 to you. 



CHAIRMAN STEIN: Right. 



PROFESSOR MCCARTHY: Eut it is a fact, 

 though, that interfering substances do occur, as you well 

 know-- 



CHAIRMAN STEIN: I don't think there is any 

 disagreement. As I understand the situation, when you 

 measure these, use the Pearl-Benson Index in certain waters 

 where you know sulfite waste liquors are not present, you 

 get certain reactions. 



HIOFE330R MCCARTHY: Surely. 



CHAIRMAN STEIN: However, they did measure 

 them here when the plants were closed and you knew they 



