...Ourcommon Aurelia measures some twelve to eighteen inches in diameter whenfull grown, and yet in the winter it is a Hydra so small as almost toescape notice... 
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...ButI am too familiar with the hydra of error to expect that by loppingoff one of the monster’s heads I can prevent another, or eventhe same, from sprouting again...
Sir James George Frazer 「The Golden Bough」
...Man’s ancestors are Gastræads, like the simplest of theactual Metazoa (Prophysema, Olynthus, Hydra, Pemmatodiscus)...
Ernst Haeckel 「The Evolution of Man」
...238), Hydra, etc...
Ernst Haeckel 「The Evolution of Man」
...(?): Herakles fighting (Acropolis) Hydra...
Various 「The American Journal of Archaeology, 1893-1」
...
Athenaappears here as a spectator, though she has no part in the pedimentalgroup; but in every other point, in the drawing of theHydra, of Herakles and Iolaos, the identity is almost complete...
Various 「The American Journal of Archaeology, 1893-1」
...The second isthe great watersnake, Hydra, which 4600 years ago stretched for 105°along the celestial equator of that day...
E. Walter Maunder 「The Astronomy of the Bible」
...Regulus lies about 9° east of Acubens, in Cancer, andabout 12° northeast of Alphard, in the heart of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...Canis Minor and the Head of Hydra are also containedon ...
Garrett Serviss 「Pleasures of the telescope」
...The geometrichead of Hydra is easily discernible east of Procyon: The star γin the Virgin is double, with a period of 145 years...
Henry Warren 「Recreations in Astronomy」
...The star Alkes is common to Hydra and Crater, and may be seen 24°southeast of Alphard in the heart of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...Situated in the heart of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...In the central portion of Hydra,represented on , we find its leading star α, sometimescalled Alphard, or Cor Hydræ, a bright second-magnitudestar that has been suspected of variability...
Garrett Serviss 「Pleasures of the telescope」
...Farther east in Hydra, as indicated near the left-handedge of , is a somewhat remarkable variable,R Hydræ...
Garrett Serviss 「Pleasures of the telescope」
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