Travels in the Blue.
A brown study; in cloudland.
“Finding him gone for ‘travels in the blueʹ I respected his mood, and did not resent his long mutism.”—Remington Annual, 1889, p. 61.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.