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Columbia Encyclopedia: Bain, Alexander
http://www.bartleby.com/65/ba/Bain-Ale.html
Concise paragraph.
The Victorian Web: Alexander Bain
http://www.victorianweb.org/science/psych/bain.htm
Biographical article, identifying Bain as a colleague of John Stuart Mill.
Wikipedia: Alexander Bain
http://www.wikipedia.org/wiki/Alexander_Bain
Article from this openly-edited reference work.