...of azular,azured, bluish, indigo, blue... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...The sugar-cane thrives, as also coffee and cotton, and indigo is a weed...
David Livingstone 「Missionary Travels and Researches in South Africa」
...The more distant peakswere soft gray-blues and purples, those nearer, indigo and black...
Mary H. Kingsley 「Travels in West Africa」
...The weather grows worse every minute, and no sign of any clearingshows in the indigo sky or the wind-reft mist...
Mary H. Kingsley 「Travels in West Africa」
...I observed likewise, near the towns, small patches of cottonand indigo...
Mungo Park 「Travels in the Interior of Africa, Vol. 1 [of 2]」
...Here tobacco, orchilla, and indigo in the higher, and sugar-cane, rice, and ricinus on the lower lands flourish to perfection...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...They also prepare indigo ina better way than what I saw at these pits...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...I am told that many cantars of indigo can bepurchased in Soudan (in Kanou), at a price whichwould bring a great profit in Tripoli; but the merchantsrefuse to engage in this commerce...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...I observedin the gardens the henna plant, the cotton plant,the indigo plant, and the tobacco plant...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...The bird's haunts are not unlike thoseof the Indigo Bunting, and its song is said to resemble theIndigo's but to be more feeble...
Frank M. Chapman 「What Bird is That?」
... Indigo, , , ...
Neltje Blanchan 「Birds Every Child Should Know」
...The body is dusky indigo blue; the tailand abdomen are ferruginous...
Douglas Dewar 「Birds of the Indian Hills」
...Specimensreferrable to the Indigo Bunting have been taken as far west as FinneyCounty, but most specimens from that far west show evidence ofinterbreeding with Lazuli Buntings...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Cyaneous: pure dark blue: indigo blue [Frenchblue]...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Indigote: a very deep indigo blue...
John. B. Smith 「Explanation of Terms Used in Entomology」
...If bruised, it assumes a verdigris hue, possibly a variant of the indigo tint peculiar to the blue-turning boletes...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
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