...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」
...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」
...Thedeeper, more permanent things find expression in the wider, flattertones, while an excess of gradations makes for prettiness, if notfor the gross roundnesses of vicious modelling...
Harold Speed 「The Practice and Science Of Drawing」
...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」
...Nature always melodizes by imperceptible gradations, while sheharmonizes by distinct contrasts...
George Field 「Field's Chromatography」
...The contrast between some is pronounced and wellmarked, whilst others exhibit refined gradations of hue...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...They are due to the motions ofthe planet round the Sun, and are invisible to the unaided eye, but witheven a small instrument, one can follow the gradations and study Mercuryunder every aspect...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...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」
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