... gazing from a high, jutting promontory, the sky all clear, showing not the slightest wisp or penciling, a bright band of cumuli will appear suddenly, coming up the canyon in single file, as if tracing a well-known trail, passing in review, each in turn darting its lances and dropping its shower, making a row of little vertical rivers in the air above the big brown one. ... — Steep Trails • John Muir
... supposition under the circumstances. This information he had left for Keith was not in the form of an intimidation. There was, indeed, something very near apologetic courtesy in the presence of the card bearing Shan Tung's compliments. The penciling of the hour on the panel of the door, without other notation, was a polite and suggestive hint. He wanted Keith to know that he understood his peculiar situation up until that particular time, that he had heard and possibly seen much that had passed between him ... — The River's End • James Oliver Curwood