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American Amphibians ancient animals apparatus average number bacteria beds birds body boiling Cailletet carbonic acid cent coin coinage conclusion condensed Cretaceous cylinder deposits Devonian diaphragm Dinosaurs doctrine of chances Dryptosaurus dust Elasmobranchs electric enemies engine Eocene Europe evidence existence experiment fact feet fishes flasks footprints forms gases genera genus germs Hadrosaurus handicraft heads Hesperornis Ichthyornis idea inch infection inference infusion instrument iron Jurassic killed kind knowledge known Labyrinthodont liquefied liquid logic magnet matter means metal mineral solution modern monogamy Mosasaurs observation opium Placoderms plate pounds practical present pressure probability produced proved Pteranodon regard relative number remains reptiles result scalp screw Silurian silver slain sound species steam-engine Stevens supposed teeth telephone temperature things Thoracosaurus tion to-day Triassic trophies true tube turnip-infusion vertebrates vessel vibrations Whitney Glacier wire York