Thus if a woman's labour in child-birth is prolonged she is given to drink water in which the charred wood of a tree struck by lightning has been dipped.

Here it is clear that the quality of swiftness is held to have been conveyed by the lightning to the wood, by the wood to the water, and by the water to the woman, so as to give her a swift delivery.

By a similar train of reasoning she is given to drink the water of a swiftly-flowing stream which thus has the quality of swiftness, or water poured through a gun-barrel in which the fouling of a bullet is left.

Here the quality of swiftness appertaining to the bullet is conveyed by the soiling to the barrel and thence to the water and to the woman who drinks the water.

In the above cases all the transfers except that to the woman are by contact.