text: I have been awaiting a letter from you, that you might inform me what new matter was revealed to you during your trip round Sicily, and especially that you might give me further information regarding Charybdis itself. I know very well that Scylla is a rock – and indeed a rock not dreaded by mariners; but with regard to Charybdis I should like to have a full description, in order to see whether it agrees with the accounts in mythology; and, if you have by chance investigated it (for it is indeed worthy of your investigation), please enlighten me concerning the following: Is it lashed into a whirlpool by a wind from only one direction, or do all storms alike serve to disturb its depths? Is it true that objects snatched downwards by the whirlpool in that strait are carried for many miles under water, and then come to the surface on the beach near Tauromenium? If you will write me a full account of these matters, I shall then have the boldness to ask you to perform another task, – also to climb Aetna at my special request. Certain naturalists have inferred that the mountain is wasting away and gradually settling, because sailors used to be able to see it from a greater distance. The reason for this may be, not that the height of the mountain is decreasing, but because the flames have become dim and the eruptions less strong and less copious, and because for the same reason the smoke also is less active by day. However, either of these two things is possible to believe: that on the one hand the mountain is growing smaller because it is consumed from day to day, and that, on the other hand, it remains the same in size because the mountain is not devouring itself, but instead of this the matter which seethes forth collects in some subterranean valley and is fed by other material, finding in the mountain itself not the food which it requires, but simply a passage-way out. There is a well-known place in Lycia – called by the inhabitants "Hephaestion" – where the ground is full of holes in many places and is surrounded by a harmless fire, which does no injury to the plants that grow there. Hence the place is fertile and luxuriant with growth, because the flames do not scorch but merely shine with a force that is mild and feeble.