... These fluctuating varieties are now all lost, and, when a branch sports into a new variety, it can generally be propagated and kept true; but, as Mr... 
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...) Fluctuating State of the Trade between 1635 and 1693...
Ambrose Blacklock 「A Treatise on Sheep:」
...Some insight into the fluctuating size of thispack was obtained on February 27 when the fiveanimals were followed for 2 hours...
L. David Mech 「Ecological Studies of the Timber Wolf in Northeastern Minnesota」
...Every art, like our own, has in its composition fluctuating as wellas fixed principles...
Joshua Reynolds 「Seven Discourses on Art」
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