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BMJ 2003;327:1228 (22 November), doi:10.1136/bmj.327.7425.1228
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EDITORProcopio alleges that I wrote that people with black skin have been chosen to live in Australia because they are protected against skin cancer. I wrote that black people were chosen by natural selection to live in Australia but did not say why.
Fifteen months after I had begun my systematic inquiry I read for amusement Malthus's essay on population.1 Being well prepared to appreciate the struggle for existence which everywhere goes on, from the long continued observation of the habits of animals and plants, I was struck at once that under these circumstances favourable variations would tend to be preserved and unfavourable ones to be destroyed.
Aboriginal Australians have succeeded in the struggle for existence for at least 60 000 years because they were able to hunt and gather. Aborigines would not have survived if their skins had not been black in Australia's intense sunlight. Procopio seems
John N Burry, retired dermatologist
PO Box 7177, Hutt Street Post Office. Adelaide, 5000 SA, Australia burlep@ozemail.com.au
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