Wallace, Alfred Russell - Conceives the idea of natural selection
Type of Spiritual Experience
A description of the experience
Oliver Sacks – Hallucinations
In 1858, Alfred Russell Wallace, who had been travelling the word for a decade, collecting specimens of plants and animas and considering the problem of evolution, suddenly conceived the idea of natural selection during an attack of malarial fever.
His letter to Darwin proposing this theory pushed Darwin to publish On the Origin of Species the following year.