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acoustic action analogy Angelique animal appearance astronomer atmosphere become body brain Cairnes called carapace carbonic acid cerebral cells chameleon clouds color condition Cottin Darwin direction disease distance doctrine echoes effect essay existence experiment fact Fahr feet furnished girl guns heard heat Herschel Hipparion horns human hypothesis ideas inches influence instruments intellectual invisible labors layer Leon Foucault lobster Lord Rosse ment mental attitude metamorphoses miles mind mirrors natural nerve object observations observatory optical organic Origin of Species pair phenomena physical plants present primitive produced Prof reflection regard remarkable result rolling of thunder Royal savage says scientific sensitive flame shadow shell side social evolution Society sound sound-waves South Foreland species Spencer steam surface telescope telson temperature tergum theory things thought tion torula truth Villejuif William Herschel yeast