There are various conventionalised types of the Dragon, but through them all one feature is constant,--the idealised serpent. Its presence is the demonic or supernatural sign. The heroic dragon-slayer must not be supposed to have wrestled with mere flesh and blood, in whatever powerful form. The combat which immortalises him is waged with all the pains and terrors of earth and heaven concentrated and combined in one fearful form. Impossible and phantasmal as was this form in nature, its mystical meaning in the human mind was terribly real. It was this Eye of anti-human nature which filled man with dismay, and conjured up the typical phantom. It was this Pain, purposed and purposing, the Agony of far-searching vision, subtlest skill, silently creeping, winged, adapted to meet his every device with a cleverer device, which gradually impressed mankind with belief in a general principle of antagonism to human happiness. It is only as a combination that any dragon form is miraculous. Every constituent feature and factor of it is in nature, but here they are rolled together in one pandemonic expression and terror. Yet no such form loses its relations with nature: it is lightning and tempest, fever-bearing malaria and fire, venom and fang, slime and jungle, all the ferocities of the earth, air, and heavens, gathering to their fatal artistic force, and waylaying man at every step in his advance. In Turner's picture of Apollo slaying the Python there is a marvellous suggestion of the natural conceptions from which the dragon was evolved. The fearful folds of the monster, undulating with mound and rock on which he lies, at points almost blend with tangle of bushes and the jagged chaos amid which he stretches. The hard, wild, cruel aspects of inanimate nature seem here and there rankly swelling to horrible life, as yet but half-distinguishable from the stony-hearted matrix; the crag begins to coil and quiver, the jungle puts forth in claws; but above all appear the monstrous EYES, in which the forces of pain, hardship, obstacle have at last acquired purpose and direction. The god confronts them with eyes yet keener; his arrow, feathered with eyebeams, has reached its mark, straight between the monster's eyes; but there is no more anger in his face than might mar the calm strength of a gardener clearing away the stone and thicket that make the constituent parts of Python.