...Althoughgonadal response and seasonal restriction of breeding are set bythe photoperiod, specific temporal relationships are dictated by moreimmediate environmental variables... 
Richard F. Johnston 「The Breeding Birds of Kansas」
...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」
...Roberts, in South Africa, has done splendid work on the periods of variables ofthe Algol type...
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」
...Thisexplanation it might have been difficult to receive, when the periods ofthe known variables were so markedly various in length...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Algol is one type of these regular variables,having a period of 68...
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 two neighboring variables just referred to areinteresting...
Garrett Serviss 「Pleasures of the telescope」
...The chief attraction in Perseus is the changeful andwonderful β, or Algol, the great typical star among theshort-period 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」
...An equation with four variables usually requires space of fourdimensions for its geometrical interpretation, and so on...
Oliver Lodge 「Pioneers of Science」
...It must, therefore, be exceedinglyerratic in its changes, resembling rather the temporarystars than the true variables...
Garrett Serviss 「Pleasures of the telescope」
...The variables S and R are both red...
Garrett Serviss 「Pleasures of the telescope」
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