The Peruvians thrashed dogs during an eclipse so that their howling would keep evil spirits away, and for the same reason, the Romans beat their pots and pans, lifted up torches and fire-brands into the air. The people of the Northern nations also created a great din, for they imagined that the sun was pursued by fierce wolves (Skoll and Hati), who tried to swallow their brilliant prey so that the world would return to its primeval darkness. Crooke, in "Popular Religion and Folk-Lore," says that "A high-caste Hindu will eat no food that has remained in the house during an eclipse, and all earthen vessels which are in the house at the time, must be broken. During an eclipse all household business is suspended, and eating and drinking is prohibited, even sleep at such times is forbidden, for it is then that the demons and devils are most active. The most effectual way of scaring the demon Rahu and releasing the afflicted planets is to bathe in some sacred stream and for protection, a Brahman should stand in the water beside the worshipper and recite the Gayatri." It is said that at such times the rivers are covered with human heads. Some barbarian tribes imagined that when the sun or moon began to lose its light, the orb was sickening under the arts of a wicked magician and they danced and screamed and beat their tomtoms in a wild frenzy so that the wicked one might become afraid and steal away. The well-known idea of the Chinese, however, is the most interesting of all, for there are records showing that for several thousand years these people believed that an eclipse was caused by the attempt on the part of a huge black dragon to seize the burning ball and swallow it. The dread of such a catastrophe so preyed upon the minds of the populace that it is reported in the "Tshu-King," one of the oldest chronicles in existence, that the ancient astronomers Ho and Hi had their heads laid before their feet for failing to predict an eclipse of the sun. Plenty of time to get out drums and kettles and to make the deafening noise which had always caused the monster to drop the sun was always given after this little incident. Douglas, in "History of China," relates that at this time, the intervention of every official in the country is called upon to save the sun from being destroyed.