The whole upper part of the Mount, from where we pitched our tents, which was near the sandstone formation, is limestone with its varieties. It lies horizontally, and is stratified with unusual regularity. This can be seen with great distinctness on the west side of the Mount, where the deep hollow, in which a branch of the river Beyroot heads, terminates against the cone, and makes a regular, steep, sloping descent of, I should think, from four to six thousand feet. Near the top, on the west side, I saw a small spot of fine white marble--much of the rock, indeed, approximates to marble. High up, at the north-east corner, we found some limestone breccia, and saw, also, in various places, much arragonite, which is a peculiar and rare variety of crystallised limestone. But what gave us most interest were the shells which we found at many places as we ascended, and also on the top itself. We found some very fine specimens of them--four or more varieties. I procured several, nearly as large as a common conch shell; all of them were petrified. At various places on the side, and also on the summit, we saw rocks that appeared little else than a mass of shells. As to when and how they got there, I have at present but little to say. Of one thing, however, I am fully satisfied, that they do not contradict the Mosaic account. It is possible that they may, with other facts which are collecting, prove, finally, that in some points we have put a wrong construction on the Mosaic account. Thus it was when the newly received system of astronomy was first brought forward. It was assailed with more zeal than knowledge, by a certain class of religionists, who insisted that it was at variance with the Bible, which said the sun rose and set; whereas, this new system made the sun stand still and the earth turn round,--and not only the anathemas of the church, but the fire and fagot were called into requisition, to maintain the good old received opinion, that the earth stood still for the quiet of man, and the sun, moon, and stars, which had nothing else to do, went round and round to give him light. It was, however, found out at last, that the truth in astronomy was not at war with truth in revelation--that the earth might turn round, and move at the same time in its orbit, without infringing, in the least, against the truths of the Bible. Thus, I doubt not, it will be found with the geological fossils, which are now accumulating, and some of them are truly singular. They will be found to coincide with revelation.