3. The serpent has received its name because it crawls (_serpit_) with unnoticed steps; for it does not go with strides that are observable, but creeps on by the trifling impulses of its scales. But those that go on four feet, like lizards and newts, are called not serpents but reptiles. Now serpents are reptiles because they creep (_reptant_) on their belly and breast; and there are as many poisons as there are genera; as many deaths as there are species; as many dolors, as colors. 4. The dragon (_draco_) is the largest of all serpents and of all living things upon earth. This the Greeks call δράκοντα. And it was taken into the Latin so that it was called _Draco_. And frequently being dragged from caves it rushes into the air, and the air is thrown into commotion on account of it. And it is crested, has a small face and narrow blow-holes through which it draws its breath and thrusts out its tongue. And it has its strength not in its teeth but in its tail, and it is dangerous for its stroke, rather than for its jaws. 5. It is harmless in the way of poison, but poison is not necessary for it to cause death, because it kills whatever it has entangled in its folds. And from it the elephant is not safe because of its size. For it lies in wait near the paths by which elephants usually go, and entangles the elephant’s legs in its folds, and kills it by strangling. It grows in Ethiopia and in India, in the very burning of perennial heat. 12. It is said that when the asp begins to feel the influence of the wizard who summons her forth with certain forms of words suited thereto, in order that he may bring her out from her hole—when the asp is unwilling to come forth, she presses one ear against the earth, and the other she closes and covers up with her tail, and so refuses to hear those magical sounds, and does not come out at the incantation. 36. The Salamander is so called because it is strong against fire; and amid all poisons its power is the greatest. For other [poisonous animals] strike individuals; this slays very many at the same time; for if it crawls up a tree, it infects all the fruit with poison and slays those who eat it; nay, even if it falls in a well, the power of the poison slays those who drink it. It fights against fires, and alone among living things, extinguishes them. For it lives in the midst of flames without pain and without being consumed, and not only is it not burned, but it puts the fire out. Chapter 5. On worms. 1. A worm is a creature that as a rule comes into being without any begetting from flesh or wood or any earthy substance, although sometimes they are born from eggs, as the scorpion. Worms belong either to earth or water or air[336] or flesh or leaves or wood or clothes. [336] _Aranea, vermis aeris_, 12, 5, 2.