...In the second half of the pressure—thatis, when they are passing from the vertical direction (,A) to extreme obliquity backwards (, C)—the effectof their action is to give propulsion to the body...
Édouard Cuyer 「Artistic Anatomy of Animals」
...Thesegill-plates are at times used for propulsion...
Geo. H. Carpenter 「The Life-Story of Insects」
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