The Uninvited

It should have been routine. Nothing could go wrong. The anode and the cathode were behaving perfectly. The meters and dials were recording accurately. A faint effervescence stirred in the chemical solution. There was a subtle change in the speed - the experiment seemed to freeze in its tracks - the stream of gentle bubbles hovered motionless. Something inexplicable was appearing in the solution. The scientist peered harder at the vessel...It couldn't be...It was impossible...It was incredible...but it had happened! A woman's face smiled at him from the depths of the glass tank! But the face was translucent, he could see tank and solution despite its contours. "Hello, Earthman," said the face from Nowhere. He clapped a hand to his forehead and collapsed insensible. When he came to, the experiment was back to normal. What had happened? Was it all in his mind? Or had he really made contact with an alien?