It was Zachary Heigh whom Chris wanted to watch, and as a flea or a fly he often rode about on Zachary's jacket listening and observing. But it was not until the _Mirabelle_ had rounded Cape Horn one morning that Chris, in the disguise of a fly, rode unnoticed on Zachary's jacket when that sulky young man, after looking around to make sure the others were all at work, slipped down to the sailor's quarters below decks. There he dragged out his sea chest, and from under his belongings pulled out a second chest. Fitting a key to the lock, he lifted up the lid. Chris, perched on his shoulder, peered over to see the contents. They were disappointing--merely a gray powder carefully packed in a piece of tarpaulin. Wonder why it has to be kept so dry? Chris pondered, but Zachary was already refolding the tarpaulin and locking the lid. In the next moment, Zachary had uncovered a length of white coils. Then Chris understood. By golly! he exclaimed to himself, dynamite! Or gunpowder! And so much! What's it for? Zachary made no other disclosures of interest that day, but after that Chris spent all the time he could, both day and night, watching the young sailor. He was determined to discover if he could what Zachary intended to do with the gunpowder. It was hard for Chris not to be able to ask Mr. Wicker's advice and not to have his master's superior knowledge to lean on. Yet had he known it, it was just this lack which was making him quick witted and more resourceful. One night a short time after Zachary's uncovering of the gunpowder, Chris noticed that Zachary remained on deck after the others had gone to bed, and continued to sit with his back to a stanchion dreamily gazing at the starry sky. Chris was in a fever for Amos to sleep, which his good friend soon did. Then a gray mouse scuttered along the wainscot of the ship's passageways until it reached a good vantage point from which to see the young sailor on deck. Chris had chosen well; a mouse is used to the dark. For several hours Zachary remained still and the mouse dozed, woke with a start, twitched its ears, and waited. Then, long after midnight when, alone of the entire ship's company, only the helmsman and night watch were awake, Zachary very slowly slid his way to the ladder leading to the hold. The mouse, scurrying forward, was able to follow by means of a dangling rope and a leap into pitch-blackness at the rope's end. The poor mouse hit something and ricocheted off. It lay stunned for a moment or two a few inches from Zachary's feet as the sailor stood at the foot of the ladder in the black heavy air of the hold. Then Zachary lit a candle end he had brought in his pocket, and lifted it up above his head to give the maximum amount of radiance.