We reiterate our warning: Mothers, teachers, you to whom children are confided at this crisis of their lives, look well to it that you appreciate, understand, and observe the duties you have assumed. Let no false modesty prevent you from learning and enforcing those precautions, so necessary at this period of life. WHAT HASTENS AND WHAT RETARDS PUBERTY? As a rule, we find that those who develope early, fade early. A short childhood portends a premature old age. It often foreshadows, also, a feeble middle-life. Having ascertained, therefore, what is the average age at which puberty takes place with us, let us see what conditions anticipate or retard this age. The most important is _climate._ In hot climates, man, like the vegetation, has a surprising rapidity of growth. Marriages are usual at twelve or fourteen years of age. Puberty comes to both sexes as early as at ten and eleven years. We even read in the life of Mohammed, that one of his wives, when but ten years of age, bore him a son. Let another dozen years pass, and these blooming maidens have been metamorphosed into wrinkled, faded old women. The beauty of their precocious youth has withered almost literally like a flower which is plucked. Very different is it in the cold and barren regions of the far north. There man, once more partaking of the nature of his surroundings, yields as slowly to the impulses of his passions as does the ice-bound earth to the slanting rays of the summer sun. Maturity, so quick to come, so swift to leave in the torrid heats, arrives, chilled by the long winters, to the girls of Lapland, Norway, and Siberia, only when they are eighteen and nineteen years of age. But, in return for this, they retain their vigor and good looks to a green old age. Between these extremes, including as they do the whole second decade of existence, this important change takes place normally in different latitudes. We have said that in the middle temperate zone the proper age is fourteen years and six months. Let us now see what conditions lead to deviations from this age in our climate. First on the list is that sacred fire handed down to us from our ancestors, which we call, in our material language, the _constitution._ The females of certain races, certain families, it is often noticed, mature earlier than their neighbours. Jewesses, for example, are always precocious, earlier by one or two years. So are colored girls, and those of creole lineage. We can guess the reasons here. No doubt these children still retain in their blood the tropic fire which, at comparatively recent periods, their forefathers felt under the vertical rays of the torrid zone.