526 APPENDIX 



Fig. 74A and B. Pedigree cards in use at the jackson laboratory. 





A. These cards provide space for the biographic details of each animal and are a per- 

 manent record of the individual. 



B. Type B has been developed for use in the pedigreed expansion stocks of the labora- 

 tory. Items on the top of the cards appear in the same order as they do in the ledger. 

 Certain columns such as b.d. (born dead) and d.y. (died young) had been converted to the 

 uses now listed on the new card. More space has been provided for ledger numbers and 

 remarks. 



