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.
"But," we might say, "aren't they satisfied? We are. It's all plain enough to us now that one kind of rock does change into another. Then why do these geologist people go on getting more evidence when they've already got enough? It's like a boy learning two lessons when he only has to recite in one; and whoever heard of such a thing!"
THESE BOYS JUST LOVE TO STUDY
The answer is that this "going on" is one of the many delights of study, particularly in Nature's books, when once you get the habit.
From a photograph by Frith & Co., Ltd., Reigate