...It is not hereby meant to ignore the fact thatdifferential responses to dominant environmental variables occurwithin a species, indicating endogenous control over timing ofbreeding... 
Richard F. Johnston 「The Breeding Birds of Kansas」
...Let us assume that each of the environmental variables isa nonlinear oscillator, as is probable...
Richard F. Johnston 「The Breeding Birds of Kansas」
...There are many variables of the Algol type, and information issteadily accumulating...
George Forbes 「History of Astronomy」
...The number of known variables of the Algol type is, so far, small; notmuch indeed over thirty...
Cecil G. Dolmage 「Astronomy of To-day」
...—In addition to thesethere is a certain further number of binary variables inwhich both components are bright and where the variationof brightness follows a very different course...
George C. Comstock 「A Text-Book of Astronomy」
...Bailey's observations show that variablestars sometimes exist in large numbers in clusters, althoughthe variables thus observed are of short period...
Garrett Serviss 「Pleasures of the telescope」
...The variables S and R are both red...
Garrett Serviss 「Pleasures of the telescope」
...The variables found in them are all of short period and the changes of light show a noteworthy tendency to uniformity...
Garrett Serviss 「Curiosities of the Sky」
...An equation with four variables usually requires space of fourdimensions for its geometrical interpretation, and so on...
Oliver Lodge 「Pioneers of Science」
...The two neighboring variables just referred to areinteresting...
Garrett Serviss 「Pleasures of the telescope」
...It must, therefore, be exceedinglyerratic in its changes, resembling rather the temporarystars than the true variables...
Garrett Serviss 「Pleasures of the telescope」
...27 stars having this spectrum are variables of long period of thesame type as Md...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
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