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alive American animals annelids association neurones Barnum's American Museum become biological body brain canals carry ccelenterates cell-bodies cell-division central nervous organs central nervous system central organs Charles Willson Peale chemical clothes collecting connected Darwin dead definite density earthworm electric electric insulation embryo environment epidermis Esperanto Europe evolution fact factors fibers fire France ganglion germ cells heredity important increase individual development inheritance insulation invertebrates Italy lakes lands language Latin living long neurones mastodon ment method miles million muscles nation natural history nerve-fibers nerves neuropile outfit ovum P. T. Barnum pack painting Peale Peale's Museum Philadelphia physiology of development plants population portraits present primordia primordium principle processes production Professor region Rembrandt Rubens Peale Rubus scientific segregation sensory short neurones skeleton soil species specimens stimulus substance theory tion tissue trip unit characters ventral cord vertebrates worm