Studies in Animal Life

admit animal forms animalcule argument Articulata become bird body branches breath called capsule cats cells Cercaria chapter characters cilia classes classification colony colour common complex crustaceans cuttlefish Cuvier desiccation digestive tube dirt distinct dogs dust earth eggs Entomostraca evaporation existence experiments fact feelers fish Fixity of Species four thousand frog genera Geoffroy glass hare Hydra hypothesis idea individual Infusoria insects internal skeleton labour languages larvæ less Linnæus living lungs Magnified male mantle membrane ment microscopic molluscs Monostomum moss mouth nacre Natural History naturalists nervous system observed once Opalina organs Origin of Species original oyster parasites particles pearls Pfaff plants Polypes ponds Protozoa rabbit Radiata resemble resuscitation revive Rotifera Rotifers sand shell stomach structure surface swimming tail Tardigrades tentacles threadworms tion true variable Varieties Vertebrata vertebrate Volvox VORTICELLA watch-glass worms young zoologists