There was also the more encompassing theory developed by the 19th century polymath Herbert Spencer, who had posited a universal "law of evolution" that purported to explain the evolutionary trend from energy to life, to mind, to society and, finally, to complex civilizations. In "The Development Hypothesis" (1892[1852]), Spencer characterized evolution as "a change from an indefinite, incoherent homogeneity, to a definite, coherent heterogeneity through continuous differentiations [and integrations]." (Corning)

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