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Usually I have an imperfect capacity to apprehend smells, unless they are very positive, and it was a curious lesson to learn how intense for the time a not perfect function may become. Recent researches have shown that a drug like mercaptan may be used to test the limit of olfactory appreciation.
Roofs! There's been no wood smoke in the air on this planet because there are no forest fires and people don't burn fuel. They use electricity. So we start the largest production of wood smoke that we find convenient, and the population of a certain modified butyl mercaptan molecule will be reduced. Down to a normal level. Immediately!"
He had no knowledge of medical or chemical terms in Kerothic, but there was a box of glass ampoules bearing instructions to "crush and allow patient to inhale fumes." That sounded right. The stuff smelled like a mixture of spirits of ammonia and butyl mercaptan, but it did the job. Tallis coughed convulsively, turned his head away, coughed again, and opened his eyes.
Especially when it's realized that he was the man who developed the strain of scavengers that secrete this modified butyl mercaptan that turns men into paras!" Calhoun grinned almost hysterically. "Maybe it was an accident. Maybe he found himself the first para and was completely astonished. But he couldn't be alone in what he knew was degradation. He wanted others with him in that ghastly state.
It wasn't a great fire, considering everything. Less than ten per cent of the city burned, but ninety-odd per cent of the paras in it ceased to be paras. More, they had suddenly regained an invincible aversion to the smell of butyl mercaptan even a modified butyl mercaptan and it was promptly discovered that no normal who had smelled wood smoke became a para.
But the colony could not continue without scavengers! So our ancestors searched on other worlds, and presently they found a creature which would multiply enormously and with a fine versatility upon the wastes of our human cities. True, it smelled like an ancient Earth-animal called skunk butyl mercaptan. It was not pretty to most eyes it is revolting.
Siemens had been trained as a mechanical engineer, and, although he became an eminent electrician in later life, his most important work at this early stage was non-electrical; indeed, the greatest achievement of his life was non-electrical, for we must regard the regenerative furnace as his MAGNUM OPUS. Though in 1847 he published a paper in Liebig's ANNALEN DER CHEMIE on the 'Mercaptan of Selenium, his mind was busy with the new ideas upon the nature of heat which were promulgated by Carnot, Clayperon, Joule, Clausius, Mayer, Thomson, and Rankine.
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