The Malleus Maleficarum by Kramer and Sprenger, 1489, Excerpts
The devil has power against those who are subject to their lusts. First, they directly prevent the erection of the member which is accommodated to fructification. Secondly, they prevent the flow of the vital essences to the members in which resides the motive force, closing up the seminal ducts so that it does not reach the generative vessels, or so that it cannot be ejaculated, or is fruitlessly spilled.
In the town of
a certain young man who had an intrigue with a girl, wishing to leave her, lost his member; that is to say, some glamour was cast over it so that he could see or touch nothing but his smooth body. In his worry over this he went to a tavern to drink wine; and after he had sat there for a while he got into conversation with another woman who was there, and told her the cause of his sadness, explaining everything, and demonstrating in his body that it was so. The woman was astute, and asked whether he suspected anyone; and when he named such a one, unfolding the whole matter, she said: “If persuasion is not enough, you must use some violence, to induce her to restore to you your health.” So in the evening the young man watched the way by which the witch was in the habit of going, and finding her, prayed her to restore to him the health of his body. And when she maintained that she was innocent and knew nothing about it, he fell upon her, and winding a towel tightly about her neck, choked her, saying: “Unless you give me back my health, you shall die at my hands.” Then she, being unable to cry out, and growing black, said: “Let me go, and I will heal you.” The young man then relaxed the pressure of the towel, and the witch touched him with her hand between the thighs, saying: “Now you have what you desire.” And the young man, as he afterwards said, plainly felt, before he had verified it by looking or touching, that his member had been restored to him by the mere touch of the witch. Ratisbon
They can take away the male organ, not indeed by actually despoiling the human body. It must in no way be believed that such members are really torn right away from the body, but that they are hidden by the devil through some prestidigitory art so that they can be neither seen nor felt.
And what, then, is to be thought of those witches who in this way sometimes collect male organs in great numbers, as many as twenty or thirty members together, and put them in a bird's nest, or shut them up in a box, where they move themselves like living members, and eat oats and corn, as has been seen by many and is a matter of common report? It is to be said that it is all done by devil's work and illusion, for the senses of those who see them are deluded in the way we have said.