...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」
...It should be remembered that in some words the accentuationis variable, while in others it is fixed...
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
... 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?」
...The eggs are quite variable in size...
Chester A. Reed 「The Bird Book」
...In colour and language, possibly also in size, the Cachila is variable...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Fangs of captive cottonmouths were shed and replaced at intervals of about 21 days, but the interval was variable...
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」
...The color of the iris is variable, even infrogs from one locality...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Tarsus naked, often spurred, tail remarkably variable (for example, Turkey, Peacock);head often with a comb, wattles, or other excrescences...
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」
...The differences, however, are all variable in degree...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
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