essential part of Jewish tradition. Thus the Talmud says:
If the eye could perceive the demons that people the universe, existence would be impossible. The demons are more numerous than we are: they surround us on all sides like trenches dug round vineyards. Every one of us has a thousand on his left hand and ten thousand on his right. The discomfort endured by those who attend rabbinical conferences ... comes from the demons mingling with men in these circumstances. Besides, the fatigue one feels in one's knees in walking comes from the demons that one knocks up against at every step. If the clothing of the Rabbis wears out so quickly, it is again because the demons rub up against them. Whoever wants to convince himself of their presence has only to surround his bed with sifted cinders and the next morning he will see the imprints of cocks' feet.<sup></sup>
The same treatise goes on to give directions for seeing demons by burning portions of a black cat and placing the ashes in one's eye: "then at once one perceives the demons." The Talmud also explains that devils particularly inhabit the waterspouts on houses and are fond of drinking out of water-jugs, therefore it is advisable to pour a little water out of a jug before drinking, so as to get rid of the unclean part.
These ideas received a fresh impetus from the publication of the Zohar, which, a Jewish writer tells us, "from the fourteenth century held almost unbroken sway over the minds of the majority of the Jews. In it the Talmudic legends concerning the existence