and flesh are not as ours. Through the eons this entity has ravened in the abyss beyond our dimension, sending out its call to claim victims where it could. For this entity, by absorbing the heads and brains of intelligent creatures both of this world and of other planets, emerges with its powers and vitality greatly augmented.
"You both know that through the ages there have been certain people willing to worship the Great Ones — even the evil Aliens who have come down to us in folk-lore as demons. Every god and every entity has had its worshippers, from black Pharol to the least of the Aliens whose powers are more than human. And these cults intermingle in a very curious way, so that we find traces of a forgotten worship cropping up in far later times. When the Romans worshipped the Magna Mater in Italy's dark forests, for instance, why do you suppose they incorporated into their ritual the mystic adoration, 'Gorgo, Mormo, thousand-faced moon'? The implication is clear.
"I have gone into considerable detail, but it has been necessary to prepare you for my explanation of the origin of that pamphlet Robert found in San Pedro. I knew of this booklet, which was printed in Salem in 1783, but I had thought that there were no longer any copies in existence. That pamphlet is a trap, and a most damnable one, created by the worshippers of the Hydra to lure victims into the maw of their god!
"It purports to be merely an innocent experiment with the astral self. However, the real purpose of the thing is to open a gateway and prepare a sacrifice for the Hydra. When the booklets were first distributed, through secret underground channels, there was an epidemic of deaths in New England. Dozens of men and women were found headless, with no trace of any human murderer. Yet the real killers were the ones who performed the experiment according to the directions given in the booklet, and unknowingly let the Hydra use their vital forces to materialize on this planet.
"Baldly speaking, what happens is this: the subject, following the instructions, inhales the fumes of the drug which tears apart the veil between our world and Outside. He concentrates upon the person whom he wishes his astral to visit, and that person is doomed. For the experimenter is drawn Outside, into another dimension of space, and through a certain psychic and chemical process is temporarily made one with the Hydra. What it amounts to is this: the Hydra, using the experimenter's astral as a host, comes to earth and takes its prey — which is the person upon whom the subject has been concentrating. There is no real danger to the experimenter himself, save, perhaps, for a possible severe nervous shock. But the other — the victim — is taken by the Hydra for its own. He is doomed to eternal torment, except in certain unusual cases where he can maintain a psychic link with an earthly mind. But I need not speak of that.
"I am greatly worried. I have put through a long-distance call to Edmond's apartment, and no doubt you will hear from me tonight long before this letter can arrive. If you are rash enough to undertake the experiment before I can communicate with you, I shall be in grave danger, for you may attempt projection of your astral to Baltimore, to me. After I have posted this letter, and while I am waiting for my telephone call to be put through, I shall do my utmost to find a protective
