536 



APPENDIX 



Fig. 83. Cage tag for the pair whose 



PEDIGREE CARD IS SHOWN IN FIGURE 81. 



Fig. 84. Cage tag made out 



FOR NEW DEVIANT. 



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When a new deviant is found the procedure is similar but the information recorded 

 may differ somewhat. Suppose that three mice appear that resemble porcupines. 

 One proceeds as follows: 



1 . Determine the sexes of the deviants, mate father with daughters and mother 

 with sons. 



2. Earmark all individuals in the litter. If one wishes, the normal littermates 

 may be mated inter se. 



3. Make out cage tags with appropriate information and start a new ledger. 



The pedigree of the parents of the deviant is studied and a check is made on the 

 offspring of all collateral relatives, to see whether they have produced any abnormal 

 offspring. Ensuing litters are classified and the stock is maintained in a manner 

 most effective for continuation of the character (figures 84 and 85). 



