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Abiogenesis admitted ancient animal animalcules anthropomorphic appears appendages believe biology body called carbonic acid Carboniferous cause chalk changes character classification common Comte Comte's Comtism conception cretaceous Crustacea Darwin demonstration deposits Descartes Devonian distinct doctrine doubt earth embryonic epoch evidence existence experiment fact force forms fossil genera geological speculation geologists germs give rise globe Globigerinæ heat human Hutton Hyæna hypothesis intellectual kind laws less living matter lobster logical mass mathematics means ment Mesozoic method mind modern modification natural knowledge naturalist object observation organic Origin of Species palæontology particles Pébrine peculiar phænomena phénomènes Philosophie Positive physical science physiology plants possess practical present progress protoplasm prove question Radiolaria reason regard result rocks scientific sense Silurian structure substance suppose surface teaching term theory things thought tion truth ultramontane Uniformitarianism universe whole Xenogenesis zoology