Illustrations of Universal Progress: A Series of Discussions

abstract action aggregation alike analogy animals astronomy become body cause centre centrifugal force changes character classification comets common complex Comte concrete mathematics consciousness considered creatures crust Devonian differentiation direction division doctrine Earth emotions equal evidence evolution excitement exist fact Fauna feeling force formations forms fossils functions further genesis geological gradually gravity greater groups heat Hence Herbert Spencer heterogeneous higher homogeneous Hugh Miller human Hydrozoa ideas illustrated implies increasing individual inference John Herschel kind knowledge less manifest mass matter mental mode modifications mollusks motion muscular nature nebulæ Nebular Hypothesis nervous observation orbits organic original phenomena philosophy planets present prevision principles produced progress races relations respect ring rotation satellites Saturn scarcely sensations Silurian Sir Charles Lyell social society Solar System species specific gravity Spencer spheroid stars strata successive sundry surface theory things thought tion trace truth