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Abiogenesis admitted Agamogenesis Ancon animalcules animals anthropomorphic appear arguments believe biology body called carbonic carbonic acid cause chalk changes character Comte Comte's Comtism conception consciousness cretaceous Crustacea Darwin demonstrated deposits Descartes Devonian distinct doctrine doubt earth Echinoderm epoch evidence existence experiments fact favour Flourens force forms genera geological speculation geologists germs give rise globe Globigerina hand heat human Hyæna hypothesis kind laws less living matter lobster logical mathematics means ment Mesozoic method mind modern modification natural knowledge natural selection naturalist notion object observation offspring ordinary organisms Origin of Species paleontology Paleozoic particles Pébrine peculiar phænomena Philosophie Positive physical science physiological plants possess practical present protoplasm prove question reason result rocks scientific selection sense Silurian sort structure substance suppose teaching Teleology theory things thought tion true truth Uniformitarianism universe whole Xenogenesis