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Darwin sex

In July 1868 Darwin was still anticipating that his book would take the form of a ‘short essay’ on man (letter to Ernst Haeckel, 3 July 1868).

Males attracted to traps with two females, whose combined pheromone emission was presumably greater, had relatively smaller antennae.

As part of her Ph D project, Ms Johnson placed traps at dusk with either one or two female moths.

The number of males, and the size of their antennae, that were caught in the traps were recorded the next day.

In a letter to Alfred Russel Wallace in 1864, Darwin claimed that sexual selection was ‘the most powerful means of changing the races of man’ (Correspondence vol. He also made efforts to expand his network of informants, especially among breeders of domestic animals.