In all ages, and with every people, the arcana of life and death, the mysteries of birth, childhood, puberty, adolescence, maidenhood, womanhood, manhood, motherhood, fatherhood, have called forth the profoundest thought and speculation. From the contemplation of these strange phenomena sprang the esoteric doctrines of Egypt and the East, with their horrible accompaniments of vice and depravity; the same thoughts, low and terrible, hovered before the devotees of Moloch and Cybele, when Carthage sent her innocent boys to the furnace, a sacrifice to the king of gods, and Asia Minor offered up the virginity of her fairest daughters to the first-comer at the altars of the earth-mother. Purified and ennobled by long centuries of development and unfolding, the blossoming of such conceptions is seen in the great sacrifice which the Son of Man made for the children of men, and in the cardinal doctrine of the religion which he founded,--"Ye must be born again,"--the regeneration, which alone gave entrance into Paradise. The Golden Age of the past of which, through the long lapse of years, dreamers have dreamt and poets sung, and the Golden City, glimpses of whose glorious portal have flashed through the prayers and meditations of the rapt enthusiast, seem but one in their foundation, as the Eden of the world's beginning and the heaven that shall open to men's eyes, when time shall be no more, are but closely allied phases, nay, but one and the same phase, rather, of the world-old thought,--the ethnic might have been, the ought to be of all the ages. The imagined, retrospect childhood of the past is twin-born with the ideal, prospective childhood of the world to come. Here the savage and the philosopher, the child and the genius, meet; the wisdom of the first and of the last century of human existence is at one. Childhood is the mirror in which these reflections are cast,--the childhood of the race is depicted with the same colours as the childhood of the individual. We can read a larger thought into the words of Hartley Coleridge:-- "Oh what a wilderness were this sad world, If man were always man, and never child." Besides the anthropometric and psycho-physical investigations of the child carried on in the scientific laboratory with exact instruments and unexceptionable methods, there is another field of "Child-Study" well worthy our attention for the light it can shed upon some of the dark places in the wide expanse of pedagogical science and the art of education. Its laboratory of research has been the whole wide world, the experimenters and recorders the primitive peoples of all races and all centuries,--fathers and mothers whom the wonderland of parenthood encompassed and entranced; the subjects, the children of all the generations of mankind.