...As wewere now out of the variable winds, I thought I should not be muchpuzzled to hit upon the islands... 
Olaudah Equiano 「The Interesting Narrative of the Life of Olaudah Equiano, Or Gustavus Vassa, The African」
... Marvellous! There is in law, and consequently in politics, something variable and something invariable...
P. J. Proudhon 「What is Property?」
...The invariable element is obligation, the bond of justice, duty; the variable element is property,—that is, the external form of law, the subject-matter of the contract...
P. J. Proudhon 「What is Property?」
...They are quite variable in size, averaging2...
Chester A. Reed 「The Bird Book」
...Cardinal teeth small, fragile, variable in number, and rarely divaricated...
William Swainson 「Zoological Illustrations, Volume I」
...As one would expect, the conditions as to such combinationsare likely to be more variable in southern than innorthern regions...
Clarence M. Weed 「Butterflies Worth Knowing」
...It is very variable in size: somespecimens may be but two and a half inches across theexpanded wings, while others are four inches...
Clarence M. Weed 「Butterflies Worth Knowing」
...tumida, as defined by Goodwin(1958); we are not wholly convinced that these are valid species(rather than variable geographic races of the same species)...
J. Knox Jones 「Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country」
...In tadpoles having fully developed mouthparts the tooth-row formula of2/3 is invariable, but the coloration is highly variable...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...A loud, low, deep-toned whoo, hoo-hoo-hoo,whooo-whooo, variable, but usually on the samenote; rarely a hair-raising scream...
Frank M. Chapman 「Color Key to North American Birds」
...The stripes are variable in colour, but are always darker than the rest of the body...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The shoulder-stripe, which is so eminently characteristic of the species, is nevertheless variable in breadth, length, and manner of termination...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The differences, however, are all variable in degree...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...These, which are the distinctive and selected characters of the several breeds, are all eminently variable...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
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