341. (iv) Influx from hell brings about evil uses wherever there are such things as correspond to them. The things that correspond to evil uses, that is, to hurtful plants and noxious animals, are cadaverous, putrid, excrementitious, stercoraceous, rancid and urinous matters. Consequently in places where these are, such plants and such small animals as were mentioned above, spring forth; and in the torrid zone, similar things of larger size, such as serpents, basilisks, crocodiles, scorpions, rats and others. Everyone knows that swamps, stagnant pools, dung-hills, fetid bogs are full of such things, also that noxious insects fill the atmosphere like clouds, and noxious vermin walk the earth in armies, consuming its plants to the very roots. I once observed in my garden in the space of an ell, nearly all the dust was turned into minute insects for when it was stirred with a stick, they rose like clouds. It is evident from mere observation that cadaverous and putrid matters are in accord with these noxious and useless little animals and that they are homogeneous, and it is still more clearly seen from the cause which is that similar stenches and fumes exist in the hells where such animalcules are also to be seen. Those hells are therefore named accordingly. Some are called cadaverous, some stercoraceous, some urinous, and so on. But all these hells are covered over, that those vapours may not escape from them. For when they are opened a very little as happens when novitiate devils enter, they excite vomiting and oppressive headaches, and those that are also poisonous induce fainting. Even the dust there is of the same nature, wherefore it is called damned dust. From this it is clear that there are such noxious stenches because the two things correspond.