"I wonder what the granite did to the limestone and the other rocks around it to make them 'sugar,' or, as we say when speaking of rocks, 'crystallize'? Syrup sugars when it is heated and then cooled without stirring. I wonder if this intruding mass that is now granite didn't spout up, in melted form, from down in the earth, and heat the rocks on either side as it burst its way through. Then both this hot rock and its neighbors cooled and crystallized. That's it!" [Illustration: SPLITTING MARBLE ROCKS IN THE QUARRY This is a scene in a marble-quarry. The men are splitting up a 120-ton block. A writer in _Scribner's Magazine_, in which this illustration originally appeared, also describes the process. The wedges, carefully greased, are inserted in the drill-holes which, for a horizontal split, are neither close together nor very deep, as that is the natural plane of cleavage between the strata. Two men with sledges go down the line giving each wedge a blow--not too hard. Then two more men follow, and in go the wedges a little farther. You see it wouldn't do to rush matters, or you'd fracture the marble. The operation is so delicate, indeed, that the foreman himself gives the final blows. Then the marble cracks from hole to hole. For the vertical splits the holes, you notice, are closer together. They are also deeper. ] In some places you find these granite masses in great bosses, or domelike rocks; elsewhere in long strips, like an iron bar thrust through other rocks; in still other places in great slabs between other rocks, like a warming pan pushed between the bed-sheets on a cold winter night; but everywhere it touches other rocks these neighbors are crystallized. Now, coming back to our friends the fossils, we sometimes find limestone bordering one of these intrusive marble rocks with fossils in it, shading off into limestone containing the same kind of fossils. As you get closer to the granite mass the fossils in the marble gradually fade away until you come to marble in which there are no fossils at all. So there we get the whole story of the life, not only of marble but of granite, and what happened to them in "The Fairyland of Change" and how it happened: _Chapter I._--The limestone was made in the sea and the shell creatures helped to make it. _Chapter II._--Hot melted rock from the inside of the earth broke its way up through these limestone beds. _Chapter III._--Then, as the melted rock cooled, it changed to granite, and the limestone on either side, being first heated and then cooled, crystallized and changed to marble. Men of science have still other ways of working out this problem as to whether and how and why one kind of rock changes into another.