“Ethically and morally, man has also made progress. From the earliest dawn of recorded history strong men made slaves of the weak. Primitive man regarded woman much as he did a slave or an animal, an instrument through which his comfort and pleasure might be increased. Contrast the former custom of exposing infants, the aged, and the helpless to the elements or to wild beasts, when their presence became a burden, with the present practice of erecting orphans' homes, homes for the aged, and asylums for the helpless.”