And besides, there is no doubt that the land all about the neighbourhood in the remotest times, bore evident marks of the action of fire; for it was here that the Poets pretended that the gate of Hell was, and close by the black and dreary-looking lake Avernus, which you may read about in the Æneid of Virgil. This was also the place where the Cimmerians dwelt, whom Ulysses is said to have visited, according to Homer, on his way to the regions of the dead. THE GROTTO DEL CANO. Near here, too, was the celebrated Grotto del Cano, the cave which used to destroy the lives of small animals put into it, by means of the exhalations that rose from the bottom; but as these exhalations were heavier than the air, consisting chiefly of the gas called carbonic acid, they did not rise much above the bottom. This is what an old writer, the account of whose travels I am very fond of, says of it. "Whatsoever hath life, being thrust into the farre end, doth die in an instant. Yet entred it may be a good way with safety; neither heat nor cold will oppress you, nor is there any damp or vapour to be discerned; being perspicuous to the bottome, and the sole thereof dusty. We made triall with a dog; which we no sooner had thrust in, but without crying, or otherwise struggling than if shot to the heart, his tongue hung out, and his eyes setled in his head, to our no small amazement. Forthwith drawne out, starke, and to our seeming without shew of life, we threw him into the lake; when anon he recovered, and swimming to the shore, ran crying away as fast as hee could, to the not farre distant _Osteria_: where they get no small part of their living by shewing this place unto forreiners. And it is a sport to see how the dogs thereabout will steale away, and scud to the tops of the mountaines, at the approach of a stranger. The _French_ King _Charles_, the eighth of that name, who held the kingdome of _Naples_ for a while; made triall thereof with an Asse, which immediately died. The like befell to a foole-hardy souldier. _Peter of Toledo_ caused two offenders to be thrust thereinto, and both expired in a moment. Nor found those three gallants any better successe, who tempted God with their desperate entrance. This place was not unknowne to _Pliny_, who calleth it the Cave of _Charon_. The cause of so deadly an effect, is said to proceede from the fervent vapours ascending at invisible pores, so thin, so dry, and subtile, as not to be discerned: yet thickned by the cold that enters at the mouth of the Cave, convert into moisture, which hangs farre within on the roofe like to drops of quick-silver; and such esteemed to bee by a number. _Carona Pighyus_, desirous to informe himselfe in the mysteries hereof, ventured so farre in as to touch one of those farre of shining drops, and shewed it to his companions, who entred also, and stayed therein about a minute of an houre: sensibly perceiving the heat to arise from their feet to their