FIELD N 

 Columns 47 and 48 



Column 48: Symbol 



(= 12 zone punch) The dosage is in terms of the biologically active 

 portion of the molecule. 



(= 1 1 zone punch) 



(a) When Field J i_s coded: The dosage coded is not the dosage 



administered to the host, but is the dose to which the test 

 organism is exposed. 



(b) When Field J is not coded: The dosage coded is not the 



dosage administered to the test organism, but is the dosage 

 to which the organ or tissue of the test organism is exposed. 



(= zone punch) Only when Field I is coded (with symbols other than 

 S through Z in Column 37): The dosage coded is not the dosage 

 administered to the host but is the dose to which the organ or 

 tissue of the test organism is exposed. 



131 



