Darwin attained the principle needed to tie his disjointed theoretical ideas together when reading Lyell's Principles of Geology.

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Darwin's theoretical ideas were significantly influenced by reading Thomas Malthus's "An Essay on the Principle of Population," which helped him formulate the principle of natural selection, not Charles Lyell's "Principles of Geology," which influenced his understanding of geological time and processes.

Darwin Attained the Principle Needed to Tie His Disjointed Theoretical