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284 I went across to the store, and looked in. Moriarty's laughing suddenly ceased, as his eye fell on me; and he respectfully rose to his feet.

"Wherefore that crackling of thorns under a pot?" I asked sternly, as I removed my belltopper and placed it on the counter. "Don't you see the spirits of the wise sitting in the clouds and mocking you?"

"Well, I'll be dashed!" he exclaimed admiringly. "You are coming out in blossom. Now you only want the upper half of your head shaved, and you could start a Loan and Discount bank, with a capital of half a million."

"Thanks, worthy peer," I replied, with dignity. "But, talking of finance, I trust you have n't forgotten the trifle that there is between us, and the terms of our agreement?"

"I'm not likely to forget. Take that chair. I 've got such fun here." He had sliced some corks into flat discs; into the centre of each disc he had stuck a slender piece of pine, about two inches in height, and spatulated at the upper end, like a paddle. Then to the flat part of each upright he had attached a blow-fly, by means of a touch of gum on the insect's back, and had placed in the grasp of each fly a piece of pine an inch long, cut into the shape of a rifle. The walking motion of the fly's feet twirled and balanced the stick in rather droll burlesque of musketry drill; and a dozen of these insects-at-arms, disposed in open order on the counter, were ministering to the young fool's mirth.

"Just you notice the gravity of the beggars," he laughed. "Not a smile on them. Solemn as Presbyterians. 'Tention! Present! Recover! Not a lazy bone in their bodies. I say, Collins: a person could make a perpetual motion, with a fly on a sort of a treadmill? Ah! but then it would n't pass muster unless it went of its own accord—would it? Perpetual motion 's a thing I've been giving my attention to lately. You remember you advised me to study mechanics? Well, I 've been thinking of arranging a clock so as to wind itself up as it went on. That 's one idea. Another is a little more complicated. It 's a water-wheel, driving a pump that throws a stream into the race that feeds the water-wheel, so that you use the same water over and over again, and the whole concern 's self-acting. The idea came into my head like an inspiration. Mind, I'm telling you in confidence, for there 's a thousand notes hanging on to it."

"Moriarty," said I sadly; "you 're worse than ever. Try something else. You're not a born mechanician."

"If I'm not, I'd like to know who the devil is?" replied the young fellow hotly. "Possibly, your own self? Was n't my father a foreman in one of the largest machine-shops in Victoria, in his day? I know what 's the matter with you. Jealousy."

"It must be so. Plato, thou reasonest well," said I hopelessly. "But supposing you are a born mechanician, you have neither the theoretical nor the practical training. Do you know for instance, the use of the brass slide you often see on a carpenter's rule?"

"Of course I do! Why I could calculate with that slide before I was ten years old."