FIELD E 

 Columns 18, 19, 20, 21, 

 22, 23, 24, and 25 



immediately appreciated and errors in coding result. All data for which the CBCC Biology Code is in- 

 tended have at least two major components, (1) a biological organism or condition treated with- -or a 

 tumor produced by--(2) a test compound; a biological organism or condition treated (or a tumor induced) 

 must be entered in Field E for every line of coded data. Field J, however, is coded only in the case of 

 a pathological condition (coded in Field E) or when the test organism (coded in Field E) is growing in or 

 maintained on a host. Field J, then, is for coding (1) the organism in which a pathological condition 

 occurs or (2) the host organism or host substance in or on which a test organism is living. The symbols 

 of one field are not in any way interchangeable with symbols of the other. Coding an organism in Field 

 E, for example, must be by use of the Field E Taxonomy Code symbols and under no circumstances is by 

 use of Field J symbols; Field J must never be coded with symbols from the Taxonomy Code of Field E. 



Specific Directions and Explanations 

 Related to Field E in General 



1. Symbols which do not fill all eight columns of Field E; unused final columns of Field E are 

 cross-hatched 



In any of the Taxonomy, Tumor, or Pathology Codes, there are items represented by symbols of 

 less than eight units. For example, if a test organism is only identified as to the family to which it 

 belongs or if it were demonstrated that all members of the family respond to the test compound as the 

 code line indicates, Field E would be coded with the symbol for the family. This would be a five-unit 

 symbol, leaving Columns 23, 24, and 25 uncoded. As a second example, any non-specific, unnamed 

 tumor would have a maximum of seven units, leaving Column 25 uncoded. The CBCC practice has 

 been to cross-hatch any such final unused code boxes of Field E, since it thereby is assurance, when 

 transferring the coding to IBM punched cards, that the final units are omitted intentionally and not 

 because of an oversight or because a new symbol for a species or a named tumor is needed in the Code. 



2. Symbols available for additional items of Field E 



Since the IBM zone punches have not been given special meanings in Field E, any number or 

 letter not already used in any of the IBM columns may be used to construct symbols for organisms, 

 tumors, or pathologies. 



3. File of coded biology data on IBM punched cards arranged according to symbols for organisms, 

 tumors, and pathologies in Field E 



The CBCC has maintained a complete file of IBM biology punched cards arranged by the Field E 

 entries, referred to ordinarily as the "Taxonomy File". (Because the part of the Biology Code which 

 has been entitled the "Taxonomy Code" is exclusively concerned with test organisms , this use of the 

 "Taxonomy File" tends to be misleading. Possibly the file would better be referred to as the Test 

 Organism-Tumor-Pathology file, since all of these are included in it. ) Thus, to retrieve all information 

 about any organism or group of organisms, or on any tumor or tumor type, or on any pathology, this 

 file permits direct manual retrieval of the appropriate cards. The cards thereby obtained can then be 

 sorted for any other specifically requested information coded in another field. 



4. Double coding in Field E 



IBM punching prohibits more than a single Field E entry on a single IBM punched card. There- 

 fore, if two or more tests demonstrate that two or more organisms (or two or more tumors or pathologies) 

 respond so nearly identically to a test compound that the only variation in the code line would be the 

 entry in Field E, coding can not be abbreviated by constructing only one line with all the organisms (or 

 tumors or pathologies) so responding coded in Field E. A line must be constructed for each organism, 

 for each tumor, or for each pathology of such a situation. 



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