Again. Some of you may have been on the Hind Head or on Leith Hill, and have looked southward over the glorious prospect of the rich Weald, spread out five hundred feet below--a sight to make an Englishman proud of his native land. Now, the mass of chalk which has been carried away began behind you, at the Hogsback, and the line of chalk-hills which runs to Boxhill, and stretched hundreds of feet above your head as you stand on Hind Head or Leith Hill, right over the old Weald of Sussex to the chalk of the South Downs. And out of the scourings of that vast mass of chalk was our gravel-pit made. Of that, and also of the Hind Head sands below it. For you will find a great deal of sharp sand in our gravel-pits, which has not, I believe, come from the grinding of chalk flints; for if it had been ground, it would not be the sharp sand it is; the particles would be rounded off at the edges. This is probably sand from the Hind Head; from what geologists term the greensands, below the chalk. And I have a better proof of this--at least I should have in every gravel-pit at Eversley--in a few pieces of a stone which is not chalk-flint at all; flattish and oblong, not more than two or three inches in diameter; of a grayish colour, and a porous worm-eaten surface, which no chalk-flint ever has. They are chert, which abound in the greensand formation; and insignificant as they look, are a great token of a most important fact; that the currents which formed our sands and gravels set from the south during a long series of ages, first till they had washed away all the chalk off the Weald, and next till they had washed away a great part of the sands, which then became exposed, the remains whereof form great commons over a wide tract of Surrey. Now let me pause, and ask you to observe one thing. How, in inductive science, we arrive, by patient and simple observation of the things around us, at the most grand and surprising results. Of course I am not giving you the whole of the facts which have made this argument certain. I am only giving you enough to make it probable to you. Its certainty has been proved by many different men, labouring in many different parts of England, and of the Continent also, and then comparing their discoveries together; often, of course, making mistakes; but each working on patiently, and correcting their early mistakes by fresh facts, till they have at last got hold of the true key to the mystery, and are as certain of the existence of the great island of the Weald, and its gradual destruction by the waves and currents of an ancient sea, as if they had seen it with their bodily eyes. You must take all this, of course, as truth from me to-night; but you may go and examine for yourselves; and see how far your own common sense and observations agree with those of learned geologists.