super brain of yours would be garbage. Only I wouldn't do that, of course. There are a few more experiments I want to make before your brain dies." Knowing the vicious nature of his partner, Mel decided to talk before the other goaded himself into some unplanned action.

"Don't forget the fable about the goose that laid the golden eggs," his voice rolled out. "There's still a lot I could do for you, you know—or not do." He saw with relief that the anger receded from the other's face to be replaced by a look of cunning.

"I almost forgot," said Neil. "I've another surprise for you." He went to a circuit near the master calculator that he himself had installed only several days ago. All the master components were open, a rheostat appearing to be the primary control. Mel had decided at the time it had to do with voltage regulation of the calculator since there had been trouble with it.

Neil placed his hand on it, then turned his head in the general direction of the tank and said, "Just in case you get ideas of not co-operating, I can use this for persuasion." He cracked the vernier just a trifle and agony knifed through Mel's brain. It receded, leaving a slight ache.

"Not much voltage," Neil was saying with satisfaction, "but, judging from the way your brain wave jumped, I don't imagine it felt very good, did it?"

"You win," was Mel's only comment, not wanting another jolt. Never before had he felt so helpless and completely at the mercy of another. He realized more and more that he had less defense than a new-born baby, which could at least kick and wave its hands. He could do nothing except try to retain his sanity and wait for his day to come....

"Good," approved his partner, his manner indicating that it was the most natural thing in the world that Mel should give in. "Just in case you forget, I think I'll keep the cart disconnected so that you can't do anything to harm yourself at night." His manner abruptly turned business-like. "Now then, that paint formula story got around and we've got a lot of business to handle. Most of it's routine for you but we'll drag it out and sock them plenty. A couple of items we'll copy after you've solved them and say it couldn't be done."

Mel missed the cart more than he thought he would. It was much like the time when, as a boy, he'd broken a leg and had to stay in bed for several weeks. He was forced to turn in on himself.

The real turn in the development of his mind, and above the level he had thought possible, came about as an accident one day. Resting, with nothing to do, he had the full room in vision with the stationary lenses. A flicker of motion caught his attention and careful waiting disclosed it to be a small mouse that had somehow gained access to the laboratory and then into his room. Welcoming any change in his routine, he watched as the small creature scurried around the room looking for something to eat. Several times Mel amused himself by causing his voice box to rumble, making the rodent scurry around madly for a hiding place until the imagined danger had passed. Eventually it became used to the noise and not even talking affected it.

It disappeared from sight for several minutes and Mel had just begun to wonder if it had a nest in the equipment when it reappeared on top of the calculator, near the electrical prod that Neil had used on his brain. Remembering the searing jolt it had given him, Mel watched anxiously as the mouse pushed an inquisitive nose into the still exposed components. He became more concerned as the animal became more intrigued. Not only was there danger that the mouse would push down on a delicate relay and close it, but he could conceivably short out the main power supply. The result wasn't pleasant to contemplate. If it didn't permanently damage some of his brain cells, the pain might drive him into insanity.

He tried shouting but the mouse paid no attention to him. He called for first, Jenkins and then Neil until he remembered that his partner had