JOSEPH L. MCCARTHY 



open for two weeks, I hope. 



PROFESSOR MCCARTHY: I would be happy to 

 try to reply to your question, but I sincerely really 

 didn't understand what you asked me. 



CHAIRMAN STEIN: The point is, if they 

 found zero in these, then there were no interfering sub- 

 stances . 



PROFESSOR MCCARTHY: At that time and place, 

 I think that is correct. 



CHAIRMAN STEIN: Right. But they did find 

 readings when the mills were in operation. Now, there can 

 be two theories. One, naturally at that time and place 

 when the mills are shut down there were no interfering 

 substances. When the mills were in operation either they 

 were--maybe there were three theories and the third might 

 be either they were measuring spent sulfite liquor or they 

 were measuring one of these interfering agents which may 

 have been produced by the mill or maybe when they were 

 measuring at all times when the mills were in operation 

 somehow the interfering substances came into that area 

 naturally. The last seems unlikely. 



Now, if they found the correlation with the 

 reading they got on the Pearl-Benson Index, whether this 

 was the interfering substance or the spent sulfite liquor 

 or whatever it was, and they related it to the mills in 



