...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」
...This conclusion is warranted if we examine what would happen tofrequency distributions if the variables or oscillators regulatingtiming were linked...
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 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」
...Are all other stars constant in brightness? The example ofMira Ceti and of other known variables makes this at least doubtful...
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」
...Two otherknown variables, both very faint, exist in the immediateneighborhood...
Garrett Serviss 「Pleasures of the telescope」
...The two neighboring variables just referred to areinteresting...
Garrett Serviss 「Pleasures of the telescope」
...Yet, again, a third class of doublestars has made itself known in the “Algol variables...
E. Walter Maunder 「Are the Planets Inhabited?」
...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」
...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」
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