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Huxley recalls having exclaimed to himself: “How extremely stupid not to have thought of that!” (F. 1854Reflecting in later life on his first reading of Charles Darwin’s On the Origin of Species, biologist, champion of evolutionary theory, and Darwin’s friend T. It is concluded that, in addition to the much-debated social pressures, an unacknowledged further reason why Darwin did not publish his theorizing until 1859, could have been down to his perceptive technical judgement: wisely, he held back from rushing to publish demonstrably flawed theorizing.ġ844 Essay 1859 Origin of Species Darwin Evolution by natural selection.Figure 1: Photograph of Charles Darwin, c. For very different reasons, neither constitutes a challenge to the basis for this comparative study. Two other collections of Darwin's theorizing are briefly considered: his extensive notes of the late 1830s and his contributions to the famous meeting of 1 July 1858. The Origin announced a new "scientific paradigm" while the Essay did little more than seemingly misconfigure the operation of a novel mechanism to extend varieties beyond their accepted bounds, and into the realm of possible new species. It is not a modification based on adjustments, further justifications and the integration of a Principle of Divergence. Consequently, Darwin's Origin theory cannot reasonably be considered as a mature version of the Essay. Even natural selection, the persistent core of Darwin's theorizing, does not prove to be a significant basis for theory similarity.

The modified descendants rebalanced the particular "plant and animal forms … unsettled by some alteration in their circumstances." But by 1859, organic adaptation occurred continuously, potentially modifying the descendants of all organisms.

In 1844, organic adaptation was confined to occasional intervals initiated and controlled by de-stabilization events.

Both were theories of evolution by means of natural selection. A comparative analysis concludes that they espoused radically different theories despite exhibiting a continuity of strategy, much common structure and the same key idea. Darwin's first two, relatively complete, explicit articulations of his theorizing on evolution were his Essay of 1844 and On the Origin of Species published in 1859.