...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」
...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」
...Yet, again, a third class of doublestars has made itself known in the “Algol variables...
E. Walter Maunder 「Are the Planets Inhabited?」
...The number of known variables of the Algol type is, so far, small; notmuch indeed over thirty...
Cecil G. Dolmage 「Astronomy of To-day」
...—On the other hand, some variablestars present an almost perfect regularity, repeatingtheir changes time after time with a precision like that ofclockwork...
George C. Comstock 「A Text-Book of Astronomy」
...—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」
...An equation with four variables usually requires space of fourdimensions for its geometrical interpretation, and so on...
Oliver Lodge 「Pioneers of Science」
...Two otherknown variables, both very faint, exist in the immediateneighborhood...
Garrett Serviss 「Pleasures of the telescope」
...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 variables T and R are oflittle interest to us, for they never become bright enoughto be seen without the aid of a telescope...
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」
...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」
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