Dream-Books ascribed to the prophet Daniel are found in Latin manuscripts at least as early as the tenth century, and continue through the fifteenth century despite the denial of their authenticity by John of Salisbury in the twelfth century. At least three different types of _Dream-Books of Daniel_ are represented in incunabula editions in the British Museum.[928] The _Dream-Book of Joseph_ occurs with less frequency.[929] These Latin _Dream-Books_ do not go into details of politics like the Byzantine books which Liutprand described. The simplest form, which we have already mentioned in speaking of the Moon-Books of the tenth and eleventh centuries, is according to the days of the moon.[930] It is often embodied in the fuller versions. Their usual arrangement is an alphabetical list of objects seen in dreams with a line of interpretation for each and perhaps a page for each letter of the alphabet. Sample lines are: _Aerem serenum videre lucrum significat_ (“To see a clear sky signifies gain”) _Intestina sua videre secreta manifesta_ (“To see one’s own intestines means secrets revealed”) This alphabetical arrangement already appears in the early manuscripts.[931] Sometimes, however, the procedure is by opening the Psalter at random, taking the first letter on the page opened to, and then referring to a list where the letters of the alphabet have various significations, such as “A signifies power of delight,” “B signifies victory in war.”[932] This last method might, of course, be employed without having any dream at all, and perhaps should not be regarded as a Dream-Book. It is interesting to note that in one manuscript it is called _Experiments of Daniel_. In these books of Daniel further instructions are sometimes given, as when it is stated that dreams which occur before midnight are of no value for purposes of interpretation, or when one is told before opening the Psalter to repeat on bended knees a Lord’s Prayer, _Ave Maria_, and _Miserere_. Days to be observed are also sometimes mentioned as a sort of accompaniment to the _Dream-Book_: forty dangerous days “which the masters of the Greeks have tested by experiment,”[933] “bromantic days” from the twenty-fourth of November to the eighteenth of December, and “perentalic days” from the first of January to the first of March. “And these are the days when the leaves fall from the trees,” which is apparently supposed to have a disturbing effect upon the clarity of dreams.[934] [Sidenote: _Sompniale dilucidarium Pharaonis._]