...The haycocks dotted the ground with their yellowish cones, now beginning to darken and take on a tone of oxidized gold... 
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...It is necessary to darken his moral and mental vision, and, as far as possible, to annihilate his power of reason...
Frederick Douglass 「My Bondage and My Freedom」
...The very young babies havenot black but light-coloured faces, which darken afterwards...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Females of luteola tend also to darken somewhatin old age but not so much as males; females of ornata donot...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...To gentle and pious pilgrims at the shrine the sightof him might well seem to darken the fair landscape, as when acloud suddenly blots the sun on a bright day...
Sir James George Frazer 「The Golden Bough」
...In allthese cases the colour of the animal is part of the charm; beingblack, it will darken the sky with rain-clouds...
Sir James George Frazer 「The Golden Bough」
...Through partially fading, moreover, they balance anytendency to darken, to which the dead colouring of earthy and metallicpigments is disposed...
George Field 「Field's Chromatography」
...Similarly, if a yellow ochre be but partiallycalcined, the red so obtained is apt to deepen or darken...
George Field 「Field's Chromatography」
...And the days darken round me, and the years,Among new men, strange faces, other minds...
Alfred, Lord Tennyson 「The Early Poems of Alfred, Lord Tennyson」
...I saw Harbauer's black brows knittogether, and mounting anger darken his face...
Various 「Astounding Stories, June, 1931」
..."You seriously propose to darken the greater part of eastern NorthAmerica?" asked the Secretary for War...
Various 「Astounding Stories of Super-Science, October, 1930」
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