SELECTIVE ELIMINATION 



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tistics, Dr. Guilfoy. The total mortality has been much reduced (chart 4), 

 largely through a reduction in the deaths in infancy and childhood. 



The most important causes of deaths may be conveniently divided into 

 three groups (a) Diseases of middle and old age, largely degenerative, in 



Chart 2. Mortality under One Year of Age. Principal Causes of Death. 

 Relation of Male to Female Deaths. New York City, 1928 



which there is little selective action, and therefore little or no reduction. 

 (b) Diseases of children as well as of adults, in which there is a moderate 

 selective action, and therefore some reduction, (c) Diseases almost ex- 

 clusively of childhood, in which there is marked selective action and a great 

 reduction in mortality. (Table 1.) 



