FIELD J 

 Columns 37, 38, 39, 

 40, 41, and 42 



HOST ORGANISM OR 

 TEST ENVIRONMENT 



Organization 



The symbols of Field J have a maximum of six units corresponding to the six IBM columns used. 

 As in the case of the code symbols for test organisms of Field E, symbols of Field J are constructed to 

 indicate the taxonomic affinities of the host organism. Thus, Column 37 is used only for indicating 

 phyla and the symbol for any given phylum or plant division is a single unit symbol of Column 37 

 (Protozoa , Symbol 1; Thallophyta , Symbol J, e. g. ). Column 38 is used only for coding classes of each 

 phylum (the symbol for any one class is a two unit symbol of Columns 37 and 38 [ Sarcodina , Symbol 1 1; 

 Ciliata , Symbol 12, e. g. ]). Similarly, Column 39 is used for distinguishing orders of each class 

 ( Amoebozoa , Symbol 111; Foraminifera , Symbol 112, e. g. ) and Column 40 distinguishes families 

 (Meleagrididae , Symbol A611; Phasianidae , Symbol A6 12). 



The phylum, class, and order designations of Field J (Columns 37, 38, and 39) are the same as 

 those designations for test organisms in Field E (Columns 18, 19, and 20). This similarity has no 

 coding significance; it was merely an expedience in constructing the Field J list subsequent to the 

 construction of the taxonomy list for Field E. However, the similarity with Field E symbols ends with 

 the designations of order; familial, generic, and specific units of Field J symbols are unique to Field J. 



The family to which the host belongs is indicated by a single unit (the fourth unit, Column 40), 

 in contrast to the familial designation of Field E which uses two units (two IBM columns). The families 

 of Field J are merely assigned sequential fourth-unit symbols as they are added to the list under each 

 order. Thus, of the order Carnivora , Canidae was the first family listed in Field J and was subsequently 

 assigned Symbol A721, while the second family listed of this order, Felidae , was assigned Symbol 

 A722, etc. 



The final two units (Columns 41 and 42) are reserved for designation of specific members of the 

 family, as well as for indicating particular varieties and strains. In other words, of the two final 

 columns in the field, one has not been dedicated to coding the genus of a host and the other dedicated 

 to coding the species of the genus. Instead, they are used together as a unit in which the host's genus 



and species names are coded as a single unit (e. g. , Cricetus cricetus, Symbol 01, Mesocricetus 



auratus. Symbol 02, etc., of family Geomyidae, Symbol A733- -). This is accomplished by the 



simple expedient of assigning sequential symbols to species or strains as they are added to the list, 

 reserving blocks of symbols for further strains and varieties of a species when it is recognized that 

 several strains exist and might be purposefully used in chemical tests. For example, of the family 

 Canidae (Symbol A721), the first member listed was the dog, Canis domesticus , and this is assigned 

 Symbol A72101 (defined as being an unspecified breed). Since there are many breeds of dogs and 

 since it is probable that it will some time be of some importance to be able to code the breed distinction, 

 a number of symbols are reserved for this purpose, A72102 through A7211Z, representing 69 symbols 

 for 69 breeds. (Although no breeds have yet actually been entered in the list, the following possibilities 

 are suggested as illustrations: Collie, A72102; German Shepherd, A72103; Doberman, A72104, etc.) 

 The next species added was the wolf, Canis nubilis , to which is assigned the symbol A72121. Although 

 it is improbable that Canis nubilis used as a host would be of a particular breed or variety, four symbols 

 are nevertheless reserved for that possibility (A72122 through A72125). Thus, the next member of the 

 list, the coyote, Canis latrans , is assigned symbol A72126 and four symbols reserved for coyote 

 varieties (A72127 through A7212A). 



Inasmuch as the two columns, as they are used, permit 1260 symbols for as many different 

 species and strains of each family , it is probable that the scheme is adequate for all hosts used in 

 chemical-biological tests. 



Considering data from all chemical-biological testing, the organism species or forms used as 

 hosts are many fewer than the number used as test organisms, largely because in many chemical- 

 biological tests, a host plays no role (i. e. , Field J is not used); further, most therapeutic testing 

 involves infection of vertebrates and higher plants and little data may be expected from chemical tests 

 in which an invertebrate or lower plant is the host (one exception being bacterial hosts of viruses). 



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