These individuals, reaching adult size some three to four years sooner than the average age, were precocious also in the earlier stages of postnatal development.
This low potential seems to be compensated for by a lower rate of postnatal mortality (especially in adults) due to the protection afforded by the closable shell and the ability to recover from serious injury.
In 1951, conditions for incubation and hatching were poor and the lack of records for that year actually represents a high rate of prenatal and postnatal mortality.
The proverb, “Train up a child in the way he should go and when he is old he will not depart from it,” to be proven to be absolutely true, must include both prenatal and postnatal training of a child.
During the first twelve months of its postnatal life, or the period of lactation, the mother’s blood, environment and education are the child’s sources of physical development.
The report by McCabe and Blanchard is valuable because molt is compared between the two species from the first to the twenty-first week of postnatal development.
Scatter diagram of postnatal growth of captive mice, showing increase in length of bodies from birth to 70 days of age.
The following listing describes changes in postnatal development of young, of each species, from birth to nine weeks of age.
This indicates that if a young animal survives the rigors of postnatal life until it is weaned, it is then at no disadvantage as far as food and water consumption are concerned.
If the parents possess good vitality and pure, normal blood and tissues, and if they apply in the prenatal and postnatal treatment of the child the necessary insight and foresight, there cannot be disease heredity.
