Editing Alfred Russel Wallace (section)

=== Further scientific work ===

In 1880, he published ''Island Life'' as a sequel to ''The Geographic Distribution of Animals''. In November 1886, Wallace began a ten-month trip to the United States to give a series of popular lectures. Most of the lectures were on Darwinism (evolution through natural selection), but he also gave speeches on [[biogeography]], spiritualism, and socio-economic reform. During the trip, he was reunited with his brother John who had emigrated to California years before. He spent a week in Colorado, with the American botanist [[Alice Eastwood]] as his guide, exploring the flora of the [[Rocky Mountains]] and gathering evidence that would lead him to a theory on how [[glaciation]] might explain certain commonalities between the mountain flora of Europe, Asia and North America, which he published in 1891 in the paper "English and American Flowers". He met many other prominent American naturalists and viewed their collections. His 1889 book ''[[Darwinism (book)|Darwinism]]'' used information he collected on his American trip and information he had compiled for the lectures.{{sfn|Shermer|2002|pp=274–278}}{{sfn|Slotten|2004|pp=379–400}}