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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 Descartes Devonian distinct doctrine doubt earth epoch evidence exhibited existence experiments fact favour Flourens force forms geological speculation geologists germs give rise globe Globigerina hand heat human Hyæna hypothesis kind laws less living matter lobster logical mass mathematics means ment Mesozoic method mind modern modification natural knowledge natural selection naturalist object observation offspring ordinary organisms Origin of Species paleontology particles Pébrine peculiar phænomena Philosophie Positive physical science physiological physiology plants possess practical present progress protoplasm prove question reason result rocks scientific sense Silurian sort structure substance suppose teaching Teleology theory things thought tion true truth Uniformitarianism universe whole Xenogenesis