...Kindly observe the neat gradations, the artistic sorites of Mpongwe lies... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...Indeed, certain carriers and runts pass into each other by such insensible gradations that an arbitrary line has to be drawn between them...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The gradations of social rank are scrupulously observed, not only on formal occasions, but also in the homes at informal and social gatherings...
Sidney L. Gulick 「Evolution Of The Japanese, Social And Psychic」
...Now, all objects are seen by the eye as patches of colour of a certainshape, with gradations of colour within them...
John Ruskin 「Lectures on Art」
...He was singular and original inhis lights, and their various gradations and reflections...
Luigi Antonio Lanzi Thomas Roscoe 「The History of Painting in Italy, Vol. 2 (of 6)」
...The stars diminishin luminosity by successive gradations, and when they sink to the sixthmagnitude reach the utmost limit at which they appear visible to thenaked eye...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...This same striving after accuracy leads to the introductionof fractional numbers to represent gradations ofbrightness intermediate between whole magnitudes...
George C. Comstock 「A Text-Book of Astronomy」
...The contrast between some is pronounced and wellmarked, whilst others exhibit refined gradations of hue...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
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