Pregunta V.

water had left prominences on the one fide, would rot the same cause have sometimes, or perhaps generally, occafioned prominences on the other side also ? Yet Don Ulloa tells us, that on the other iide there are always correfponding cavities, and that thefe tally with the prominences so perfedly, that, were the two sides to come together, they would fit in all their indentures, without leaving any void. I think that this does not refemble the effedl of running water, but looks rather as if the two sides had parted asunder. The fides of the break, over which is the natural bridge of Virginia, confifting of a veiny rock which yields to time, the correfpondence between the falient and re-entering inequalities, if it exifted at all, has now difappcared. This break has the advantage of the one defcribed by Don Ulloa in its fineft circumftance; no portion in that infiance having held together, during the feparation of the ether parts, so as to form a bridge over the abyfs.