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Necromancy is of sufficient importance to demand a section to itself.
It is justifiable in some exceptional cases. Suppose the magician fail to obtain access to living Teachers, or should he need some especial piece of knowledge which he has reason to believe died with some teacher of the past, it may be useful to evoke the "shade" of such a one, or read the "Akasic record" of his mind.
The only minds likely to be useful to the Magician belong to Adepts sworn to suffer reincarnation at short intervals, and the best elements of such minds are bound up in the "Unconscious Self" of the Adept, not left to wander idly about the Astral Plane. It will thus be more profitable to try to get into touch with the "Dead Teacher" in his present avatar. Moreover, Adepts are at pains to record their teaching in books, monuments, or pictures, and to appoint spiritual guardians to preserve such heirlooms throughout the generations. Whenever these are destroyed or lost, the reason usually is that the Adept himself judges that their usefulness is over, and withdraws the forces which protected them. The student is therefore advised to acquiesce; the sources of information available for him are probably selected by the Wardens of Mankind with a view to his real necessities. One must learn to trust one's Holy Guardian Angel to shape one's circumstances with skill. If one be but absorbed in the ardour of one's aspiration toward Him, short indeed is the time before Experience instils the certain conviction that His works and His ways are infinitely apt to one's needs.
If this be done it must be done properly very much on the lines of the evocation of Apollonius of Tyana, which Eliphas Levi performed.
See Rituel et Dogme de la Haute Magie; Rituel, ch. XIII.
The utmost care must be taken to prevent personation of the "shade". It is of course easy, but can rarely be advisable, to evoke the shade of a suicide, or of one violently slain or suddenly dead. Of what use is such an operation, save to gratify curiosity or vanity?