Mark Twain,
Roughing It — Chapter XVIII
(1872)
“ The mules, under violent swearing, coaxing and whip-cracking, would make at stated intervals a "spurt," and drag the coach a hundred or may be two hundred yards, stirring up a billowy cloud of dust that rolled back, enveloping the vehicle to the wheel-tops or higher, and making it seem afloat in a fog. ”
