“Take a slip of paper and write on it these words: I adjure you, O mice, who dwell here not to injure me yourselves nor to permit any other mouse to do so; and I make over to you this field (describing it). But should I find you staying here after having been warned, with the help of the mother of the gods I will cut you in seven pieces.” The author quotes this recipe, in order, as he says, that nothing may remain unrecorded, but expressly declares that he has no confidence in its efficiency and advises the husbandman to put his trust in good rat-bane. Bassos derived the materials for his popular encyclopædia chiefly from the “Geoponics” composed by Anatolios and Didymos some six centuries earlier, and even most of his citations of classical writers are taken from the same sources. That the above-mentioned exorcism is pagan in its origin is evident from the invocation of the aid of Cybele for the destruction of disobedient vermin. In a Christian conjuration the Mother of God would have been substituted for the mother of the gods, whom the Greeks revered as the personification of all-creating and all-sustaining nature. The resemblance of this formula, which the Greeks may have borrowed with the worship of Cybele from the Phrygians, to the Yankee’s letter of advice is peculiarly interesting. In the ancient conjuration the harmful or undesirable animals were commanded to go to a certain locality, set apart for them, and this injunction was accompanied with dire threats in case of disobedience; the milder epistolary form of the present day is more advisory and persuasive and offers them inducements to migrate and to take up their abode elsewhere. Sometimes this kind counsel is given verbally, as, for example, in Thuringia, where it is customary to get rid of cabbage-worms by going into the garden, requesting them to depart, and calling out: “In yonder village is church-ale (_Kirmes_)”; thus implying that they will find better entertainment at this festival. (Witzschel: _Sagen, Sitten und Gebräuche aus Thüringen_. Wien, 1878, p. 217.) The willingness of peasant communities to ward off evil from themselves at the expense of their neighbours is a survival of the primitive ethics, which recognizes only the rights of the family or tribe and treats all aliens as foes. It is the same feeling that causes the inhabitants of the Alps to erect so-called weather-crosses (_Wetterkreuze_) for the purpose of averting thunder-storms and hailstones from themselves by diverting them into an adjacent valley. This method of protection is based upon the theory that tempests, hurricanes, and all violent commotions of nature are the work of demons or witches, who avoid the symbol of Christ’s death and the world’s redemption and direct their fury elsewhere. A like egotism is expressed in the inscription on many houses of peasants entreating St. Florian to preserve their habitation from flames and to set fire to others, as though