ABSTRACT
The personality of an animal or thing depends primarily upon its nature or constitution. A century or more ago a great deal was written regarding animal and human constitution as related to personality, but very few facts bearing on the subject were accurately applied, although some were available. Human life or personal existence is constitutionally adapted to a very narrow range of temperature variation. The embryo must be provided with a moist environment in order to retain its own water and to proceed with normal constitution and development. The chief events, probably more than ninety-five percent of the entire development, and the dangerous steps when any mishap may cause organic deformity and, future malexistence, are passed before the day of birth. The biologist very well knows that the most important part of individual existence for man is passed and over before birth.
