...The weather was variable, but the barometer did not fluctuate by suddenmovements, and they could therefore count on tolerable weather... 
Jules Verne William Henry Giles Kingston 「Abandoned」
... Then the tradewinds, blowing regularly at other seasons, become gradually weaker, and at length cease and give way to variable winds and calms...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...The same product, at different times and in different places, may cost more or less of time and outlay; in this view, it is true that value is a variable quantity...
P. J. Proudhon 「What is Property?」
...Property, on the contrary, is the variable element of jurisprudence, its history, its policy...
P. J. Proudhon 「What is Property?」
...In colour and language, possibly also in size, the Cachila is variable...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...It can be seen from the above examples that toxicity of venoms and the resistance of the animal receiving an injection of venom is highly variable...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...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」
...Bill small, triangular when seen from above; mouth large, no bristles; tail variable,in Chætura with projecting spines; wings long and narrow; feet small and toes short;plumage usually dark...
Frank M. Chapman 「Color Key to North American Birds」
...Calls, pit, chit, or chack;song, variable, often wichity, wichity, wichity...
Frank M. Chapman 「Color Key to North American Birds」
...Song, a rather loud wee-chee, chee, chee,cher-wee, variable in form but recognizable in tone...
Frank M. Chapman 「Color Key to North American Birds」
...
Fourteen subspecies of this wide-ranging, variable form are nowrecognized in America, north of Mexico...
Frank M. Chapman 「Color Key to North American Birds」
...The females in the series are highly variable in colorindividually, but are on the average paler than C...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...Brent, however, assures me that the number is variable with other domestic rabbits...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
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