But she did not come now to run about and play hide-and-seek among the winding ways; those days were over, and the sorrowful time, which had passed since then, had taught her precious lessons. Her father's Friend was _her_ Friend now, and she loved to carry the Bible, which had belonged to her father, down into the mine, and while the miners were taking their dinner or their short rest, she used to sit beside them and read them chapters and psalms, and so became a little messenger to tell them of the love of God. Do you know a hymn about shining in this world--where so "many kinds of darkness" are found--for the Lord Jesus Christ? I do not know whether this child had ever heard of it, but it is very sweet to see that the Lord had taught her to shine--as the hymn says--"first of all for Him"; then in her little corner in that humble cottage where she tried, in spite of her own sore trouble, to be a cheer and comfort to the miner's wife; and then He gave her a little corner in the dark mine where she might shine "Like a little candle Burning in the night." The rough men loved this gentle child who had known sorrow so early. They listened as she read to them, and used to say she was their good angel. If we remember that an angel means a messenger, we shall perhaps think it not a wrong name to give to her, since she read to them God's Book, which is His message to us. While we were talking about the earth-crust, I daresay you were wishing to know, as I did, how thick it is--how far down the layers of rocks go, and what lies underneath the lowest layer of all. These are questions which cannot be answered; for no one has ever been able to search so far into the hidden parts of the earth as to tell us what lies beneath those fire-rocks, which are the lowest known, although they are sometimes found upon the tops of mountains, cast up by a mighty heaving of the crust, such as happens when there is an earthquake, or what is called the "eruption" of a volcano. But what power could be strong enough to heave up solid rocks, and to make the firm ground upon which we tread, and upon which the houses are built, waver to and fro like the restless sea, so that the strongest buildings begin to totter and fall, and the bravest men run for their lives? It is the mighty power of steam--caused by the great heat far down below--which, when it does come to any part of the earth's surface, makes itself known in very terrible ways.