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admitted Agamogenesis Ancon animals anthropomorphic appears arguments believe Biology body called carbonic carbonic acid Carboniferous cause chalk changes character classification coccoliths common Comte Comte's Comtism conception consciousness cretaceous Crustacea Darwin deduction demonstrated deposits Descartes Devonian distinct doctrine doubt earth epoch evidence exhibited existence fact Flourens force forms genera geological speculation geologists globe Globigerina hand human Hutton Hyæna hypothesis ignorance intellectual kind laws less living lobster mass mathematics matter means Mesozoic method mind modern modification natural knowledge natural selection naturalists naturelle notion object observation offspring organisms Origin of Species paleontology peculiar phænomena Philosophie Positive physical science physiology plants possess practical present protoplasm question reason regard result rocks schools scientific selection sense Silurian sort structure substance suppose teaching Teleology theory things thought tion true truth Uniformitarianism universe varieties whole