Dr. Oliver thinks that in the Scandinavian Mysteries he has found the mystic ladder in the sacred tree _Ydrasil;_[83] but here the reference to the septenary division is so imperfect, or at least abstruse, that I am unwilling to press it into our catalogue of coincidences, although there is no doubt that we shall find in this sacred tree the same allusion as in the ladder of Jacob, to an ascent from earth, where its roots were planted, to heaven, where its branches expanded, which ascent being but a change from mortality to immortality, from time to eternity, was the doctrine taught in all the initiations. The ascent of the ladder or of the tree was the ascent from life here to life hereafter--from earth to heaven. It is unnecessary to carry these parallelisms any farther. Any one can, however, see in them an undoubted reference to that septenary division which so universally prevailed throughout the ancient world, and the influence of which is still felt even in the common day life and observances of our time. Seven was, among the Hebrews, their perfect number; and hence we see it continually recurring in all their sacred rites. The creation was perfected in seven days; seven priests, with seven trumpets, encompassed the walls of Jericho for seven days; Noah received seven days' notice of the commencement of the deluge, and seven persons accompanied him into the ark, which rested on Mount Ararat on the seventh month; Solomon was seven years in building the temple: and there are hundreds of other instances of the prominence of this talismanic number, if there were either time or necessity to cite them. Among the Gentiles the same number was equally sacred. Pythagoras called it a "venerable number." The septenary division of time into weeks of seven days, although not universal, as has been generally supposed, was sufficiently so to indicate the influence of the number. And it is remarkable, as perhaps in some way referring to the seven-stepped ladder which we have been considering, that in the ancient Mysteries, as Apuleius informs us, the candidate was seven times washed in the consecrated waters of ablution.