It is interesting to observe that where an opposite result is desired, primitive logic enjoins the weather-doctor to observe precisely opposite rules of conduct. In the tropical island of Java, where the rich vegetation attests the abundance of the rainfall, ceremonies for the making of rain are rare, but ceremonies for the prevention of it are not uncommon. When a man is about to give a great feast in the rainy season and has invited many people, he goes to a weather-doctor and asks him to "prop up the clouds that may be lowering." If the doctor consents to exert his professional powers, he begins to regulate his behaviour by certain rules as soon as his customer has departed. He must observe a fast, and may neither drink nor bathe; what little he eats must be eaten dry, and in no case may he touch water. The host, on his side, and his servants, both male and female, must neither wash clothes nor bathe so long as the feast lasts, and they have all during its continuance to observe strict chastity. The doctor seats himself on a new mat in his bedroom, and before a small oil-lamp he murmurs, shortly before the feast takes place, the following prayer or incantation: "Grandfather and Grandmother Sroekoel" (the name seems to be taken at random; others are sometimes used), "return to your country. Akkemat is your country. Put down your water-cask, close it properly, that not a drop may fall out." While he utters this prayer the sorcerer looks upwards, burning incense the while. So among the Toradjas the rain-doctor, whose special business it is to drive away rain, takes care not to touch water before, during, or after the discharge of his professional duties. He does not bathe, he eats with unwashed hands, he drinks nothing but palm wine, and if he has to cross a stream he is careful not to step in the water. Having thus prepared himself for his task he has a small hut built for himself outside of the village in a rice-field, and in this hut he keeps up a little fire, which on no account may be suffered to go out. In the fire he burns various kinds of wood, which are supposed to possess the property of driving off rain; and he puffs in the direction from which the rain threatens to come, holding in his hand a packet of leaves and bark which derive a similar cloud-compelling virtue, not from their chemical composition, but from their names, which happen to signify something dry or volatile. If clouds should appear in the sky while he is at work, he takes lime in the hollow of his hand and blows it towards them. The lime, being so very dry, is obviously well adapted to disperse the damp clouds. Should rain afterwards be wanted, he has only to pour water on his fire, and immediately the rain will descend in sheets.