Of the books of bad necromantic images for each of the seven planets by Hermes, which the _Speculum astronomiae_ censured, at least one seems to have been preserved for our inspection in the manuscripts, since it has the same _Incipit_ as that cited by Albert, “_Probavi omnes libros_ ...,” and the same title, _Liber lune_,[686] or _Book of the Moon_, or, as it is more fully described, of the twenty-eight mansions and twenty-eight images of the moon and the fifty-four angels who serve the images. And as Albert spoke of a treatise of magic illusions which accompanied the seven books of necromantic images for the planets, so this _Liber lune_ is itself also called _Mercury’s magic illusion_.[687] It probably is the same _Book of Images of the Moon_ which William of Auvergne described as attempting to work magic by the names of God. The treatise opens in the usual style of apocryphal literature by narrating how this marvelous volume came to be discovered. After some “investigator of wisdom and truth and friend of nature had read the volumes of many wise men,” he found this one in a golden ark within a silver chest which was in turn placed in a casket of lead,--a variant on Portia’s method. He then translated it into Arabic for the benefit of the many. Nevertheless we have the usual caution to fear God and not show the book to anyone nor allow any polluted man to touch it, since with it all evils as well as all goods may be accomplished. It tells how to engrave images as the moon passes through each of its twenty-eight houses. The names of angels have to be repeated seven times and suffumigations performed seven times in the name of God the merciful and pious. Just as the moon is nearer to us than other planets and more efficacious, so this book, if we understand it aright, is more precious than any other. Hermes declares that he has proved all the books of the seven planets and not found one truer or more perfect than this most precious portion. Balenuch, however, a superior and most skilful philosopher, does much of the talking for his master Hermes. The Latin text retains the Arabic names for the mansions of the moon, the fifty-four angels also have outlandish names, and a wood that grows in an island in India is required in the suffumigations. Instructions are given for engraving images which will destroy villa, region, or town; make men dumb; restrain sexual intercourse within a given area; heat baths at night; congregate ten thousand birds and bees; or twist a man’s limbs. Four special recipes are given to injure an enemy or cause him to sicken. [Sidenote: Hermes on images of the seven planets.]