She, on her part, had distinguished with a woman's natural instinct the curious duality of his character.
"Paul Patoff"
F. Marion Crawford
Confusion of thought, and consequent confusion of object, is fatal to any conception,-at least, to any military conception; it is absolutely opposed to concentration, for it implies duality of object.
"Lessons of the war with Spain and other articles"
Alfred T. Mahan
Even in the present they were two in one, in the narrowest, the most accurate sense of the phrase, for their duality was also perceptible in their spiritual union; as, when a green current mingles with a blue current, it sometimes happens, at the beginning of their united course, that broken waves flash here and there-some the colour of the woods, some as blue as the sky.
"The Saint"
Antonio Fogazzaro Commentator: William Roscoe Thayer