Heredity and Environment
The rolesofthe environmentinthe mentalcompositionarestillam-
biguous.Thereisalsoaprevalentbeliefthattheenvironmentalchanges
influence heredity. Through many thirty-year experimentalstudies on
plants,animalsandhumanbeings,hereditistscouldsubvertthisthought
when they proved that the environment is no more than a secondary
factorof heredity.The environment can decidethe emergence andex-
tents of the qualities and their growth. Therefore, heredity selects the
constant factors, while the environment selects the changeable.
The environment would never producemattersthat are contrary to
heredity becauseit isnot subjected to the factors of changeability and
variableness..