Yet the sight that met their eyes as they emerged on the road was terrifying. The massed black clouds were still mounting the twilight sky. High above them, at a vast height, a dreadfully vast height, bodiless black birds, more like skeletons of birds, were drifting. Snowstorms drove along the summit of Ixtaccihuatl, obscuring it, while its mass was shrouded by cumulus. But the whole precipitous bulk of Popocatepetl seemed to be coming toward them, travelling with the clouds, leaning forward over the valley on whose side, thrown into relief by the curious melancholy light, shone one little
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