Jordania suggested that peacock's display of colourful and oversize train with plenty of eyespots, together with their extremely loud call and fearless behaviour has been formed by the forces of natural selection not sexual selection , and served as a warning aposematic display to intimidate predators and rivals. To answer the question, Darwin had introduced in the Origin the theory of sexual selection , which outlined how different characteristics could be selected for if they conveyed a reproductive advantage to the individual. In late , Darwin tackled a new edition of the Descent of Man.
Wood , who had also illustrated Wallace's The Malay Archipelago One of these, later known as Social Darwinism , had been put forward by Herbert Spencer before publication of Origin, and argued that society would naturally sort itself out, and that the more "fit" individuals would rise to positions of higher prominence, while the less "fit" would succumb to poverty and disease.
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We must therefore bear the undoubtedly bad effects of the weak surviving and propagating their kind; but there appears to be at least one check in steady action, namely that the weaker and inferior members of society do not marry so freely as the sound; and this check might be indefinitely increased by the weak in body or mind refraining from marriage, though this is more to be hoped for than expected. Neither Galton nor Darwin, though, advocated any eugenic policies such as those undertaken in the early 20th century, as government coercion of any form was very much against their political opinions.
We must therefore bear the undoubtedly bad effects of the weak surviving and propagating their kind; but there appears to be at least one check in steady action, namely that the weaker and inferior members of society do not marry so freely as the sound; and this check might be indefinitely increased by the weak in body or mind refraining from marriage, though this is more to be hoped for than expected. Retreating from his egalitarian ideas of the s, he ranked life on a hierarchic scale which he extended to human races on the basis of anthropology published since