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biologist, was injecting mice with various serums for the purpose of finding an injection which would cause mutations. When he injected his 3019th mouse, the mouse disappeared. It was still there; he could feel it in his hand, but he could not see a hair or claw of it. He put it carefully in a cage and two hours later it appeared again, unharmed.
    He experimented with increasing dosages and found that he could make a mouse invisible for up to twenty-four hours. Larger doses made it ill or torpid. He also learned that a mouse killed while invisible reappeared instantly at the moment of death.
    Realizing the importance of his discovery, he wired his resignation to England, dismissed his servants and locked himself in his quarters, and began to experiment with himself. Starting with a small injection that made him invisible for only a few minutes, he worked up until he found his tolerance was equal to that of mice; an injection that made him invisible for more than twenty-four bows also made him ill. He also found that although nothing of his body was visible, not even his dentures if he kept his lips closed, nudity was essential; clothing did not become invisible with him.
    Praeter was an honest and fairly well-to-do man, so he did not think of crime. He decided to return to England and offer his discovery to His Majesty’s government for use in espionage or war.
    But he decided first to allow himself one indulgence. He had always been curious about the closely guarded harem of the Sultan to whose court he had been attached. Why not have a close look at it from inside?
    Besides, something—some nagging thought that he couldn’t quite isolate—bothered him about his discovery. There was some circumstance under which… He couldn’t get beyond that point in his mind. An experiment was definitely in order.
    He stripped and made himself invisible for the maximum period. It proved simple to walk past the armed eunuchs and enter the harem. He spent an interesting afternoon watching the fifty-odd beauties at their daytime occupation of keeping themselves beautiful, bathing and anointing their bodies with scented oils and perfumes.
    One, a Circassian, especially attracted him. It occurred to him, just as it would have occurred to any man, that if he stayed the night—perfectly safe since he would be invisible until the following noon—he could keep her in sight to learn which room she slept in and, after the lights were out, join her; she would think the Sultan was favoring her with a visit.
    He kept her in sight and noticed the room she entered. An armed eunuch took his post at the curtained doorway, others at each of the other doorways to the sleeping rooms. He waited until he was sure she would be asleep and then, at a moment when the eunuch was looking down the hall and would not see the movement of the curtain, he slipped through it. The light had been dim in the hallway; here the darkness was utter. But he groped carefully and managed to find the sleeping couch. Carefully he put out a hand and touched the sleeping woman. She screamed. (What he had not known was that the Sultan never visited the harem by night but sent for one, or sometimes several, of his wives to visit his own quarters.)
    And suddenly the eunuch who had been outside was inside and had hold of him by the arm. The last thing he thought was that he now knew the one worrisome circumstance of invisibility: it was completely useless in pitch darkness. And the last thing he heard was the swish of the scimitar.

GREAT LOST DISCOVERIES II –
Invulnerability
    The second great lost discovery was the secret of invulnerability. It was discovered in 1952 by a United States Navy radar officer, Lieutenant Paul Hickendorf. The device was electronic and consisted of a small box that could be carried handily in a pocket; when a switch on the box was turned on the person carrying the device was surrounded by a force field whose strength, as far as it could be measured by