..., ducat (a gold coin of variable value)... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...As long as easterly winds prevail, all enjoy good health; but in January, February, March, and April, the winds are variable, and sickness is general...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Cardinal teeth small, fragile, variable in number, and rarely divaricated...
William Swainson 「Zoological Illustrations, Volume I」
... Individual yield is so variable that a large number of snakes must be milked in order to determine the average yield...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Development of these crescents is variable but in all thespecimens the crescents are confined to the anterior half of the body...
Henry S. Fitch 「Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains」
...Upper yellowish olive-green; wings, tail brown, tippedwhite; under whitish, streaked black; bill flesh-red;eyes scarlet; variable in color; f...
John Albert Leach 「An Australian Bird Book」
...The coloration in life is as variable as it is in preservative...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Calls, pit, chit, or chack;song, variable, often wichity, wichity, wichity...
Frank M. Chapman 「Color Key to North American Birds」
...micropus from Tamaulipas reveals that thedepth of the re-entrant angle of M1 is extremely variable, from almostabsent in some individuals to deep (as in angustapalata) in others...
Ticul Alvarez 「The Recent Mammals of Tamaulipas, Mexico」
...Certain parts of the scapula and the terminal sternal bones have become highly variable in shape...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
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