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action adapted aerostat Albert Tissandier American Journal animal appears astronomer balloon become beech black poplar body bolometer caterpillars cause climate colors Davos diet digestion direction disease dyspepsia earthquakes echinus effects eggs elevation ence existence experience fact Fahr favorable feet Government greater habit Harvard College Observatory heat horse-chestnut hundred idea important inches interest internodes Journal of Sci kind leaf leaves less light material means ment moral morphia moths Mount Whitney natural nearly object observations observatory organic period persons phyllodes plant practical present principle Professor Langley proportion railroads and telegraphs rays regard result rocks scientific scorpions shock side Silurian snow social society solar species specimens star-fish stars steatite stomach stomata success surface sycamore temperature theory tion Tissandier trees variable stars vegetarian wings winter Yakuts York