One of those wise old fairy tales, that come from nowhere and flourish everywhere, tells how a man came to own a small magic machine like a coffee-mill, which would grind anything he wanted when he said one word and stop when he said another. After performing marvels (which I wish my conscience would let me put into this book for padding) the mill was merely asked to grind a few grains of salt at an officers’ mess on board ship; for salt is the type everywhere of small luxury and exaggeration, and sailors’ tales should be taken with a grain of it. The man remembered the word that started the salt mill, and then, touching the word that stopped it, suddenly remembered that he forgot. The tall ship sank, laden and sparkling to the topmasts with salt like Arctic snows; but the mad mill was still grinding at the ocean bottom, where all the men lay drowned. And that (so says this fairy tale) is why the great waters about our world have a bitter taste. For the fairy tales knew what the modern mystics don’t — that one should not let loose either the supernatural or the natural.
– Eugenics and Other Evils (1922).