54 



MAN THE ANIMAL 



consider briefly the analysis of the pedigrees of persons who have 

 actually achieved great longevity. For many years we have 

 been collecting data about persons actually living at ages of 

 ninety years and above. The collection now includes more than 



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12 3 



Fig. 4. Pedigree of individual having- highest observed TIAL 



2000 such persons, for whom the personal and family records 

 may be accepted as reliable and trustworthy, after having been 

 thoroughly and critically checked. Many more cases than this 

 have gone through our hands, but have been rejected for scien- 

 tific study because they did not meet the standards of proof 

 that were set up. 



