FIELD U 

 Columns 65 and 66 



11. File of IBM Punched Cards 



No file of coded biology data has been established, arranged by Field U entries. Information 

 coded in Field U is of such a nature that sorting for it is almost invariably subsequent to retrieval of 

 information by specific actions, test organisms, test compounds, etc. (for which there are special 

 IBM files). 



12. Double coding 



Field U should never be double coded when using Criterion 10, 11, 12 or 13 in Field X. However, 

 when evaluation is based on the incidences (in a group of organisms) of several time values (several 

 durations of action, several time periods to specific action, etc. ) and the Grid is used (Criterion 54, 

 57, 58, or 59), Field U can be double coded, if necessary, to show the upper and lower time limits 

 within which range are all the time values giving the evaluation coded in Field Y. 



Symbol * can be entered in the same code box (Column 66) as the coding of a time value, as 

 explained in Division 4. 



Double coding is permitted in Field U under the conditions described above, but only in 

 Column 66. When Field U is double coded in Column 66 or when Symbol * is coded with another 

 symbol in that column, both coded symbols are punched on the same IBM card in that column. 



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