What, then, with the natural desires, affections, and emotions common to the whole race, what with the tendencies which each family derives by descent, and those peculiarities which the individual owes to his own constitution of body and brain, — human nature, the sum of all these, makes out for itself a strong case; so much so, that we are inclined to think the best that can be done is to let it alone, to let every child develop unhindered according to the elements of character and disposition that are in him.