Charles Grant Blairfindie Allen (February 24, 1848 – October 25, 1899) was a Canadian science writer and novelist, and a proponent of the theory of evolution.
Allen was born near Kingston, Canada West (now incorporated into Ontario), the second son of Catharine Ann Grant and the Rev. Joseph Antisell Allen, a Protestant minister from Dublin, Ireland. His mother was a daughter of the fifth Baron of Longueuil. He was educated at home until, at age 13, he and his parents moved to the United States, then France and finally the United Kingdom. He was educated at King Edward's School in Birmingham and Merton College in Oxford, both in the United Kingdom. After graduation, Allen studied in France, taught at Brighton College in 1870–71 and in his mid-twenties became a professor at Queen's College, a black college in Jamaica.
Despite his religious father, Allen became an agnostic and a socialist. After leaving his professorship, in 1876 he returned to England, where he turned his talents to writing, gaining a reputation for his essays on science and for literary works. One of his early articles, 'Note-Deafness' (a description of what is now called amusia, published in 1878 in the learned journal Mind) is cited with approval in a recent book by Oliver Sacks.
His first books were on scientific subjects, and include Physiological Æsthetics (1877) and Flowers and Their Pedigrees (1886). He was first influenced by associationist psychology as it was expounded by Alexander Bain and Herbert Spencer, the latter often considered the most important individual in the transition from associationist psychology to Darwinian functionalism. In Allen's many articles on flowers and perception in insects, Darwinian arguments replaced the old Spencerian terms. On a personal level, a long friendship that started when Allen met Spencer on his return from Jamaica, also grew uneasy over the years. Allen wrote a critical and revealing biographical article on Spencer that was published after Spencer was dead.
After assisting Sir W. W. Hunter in his Gazeteer of India in the early 1880s, Allen turned his attention to fiction, and between 1884 and 1899 produced about 30 novels. In 1895, his scandalous book titled The Woman Who Did, promulgating certain startling views on marriage and kindred questions, became a bestseller. The book told the story of an independent woman who has a child out of wedlock.
In his career, Allen wrote two novels under female pseudonyms. One of these was the short novel The Type-writer Girl, which he wrote under the name Olive Pratt Rayner.
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"Never as long as I live shall I forget the ecstasy of terror, astonishment, and blank dismay which seized upon me when I stepped into that seemingly enchanted chamber. ... I gazed fixedly at the strange picture before me, taking in all its details in a confused way, yet quite incapable of understanding or realizing any part of its true import."