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In page Early Islamic philosophy:

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English translations of the Encyclopedia of the Brethren of Purity were available from 1812,[9] while Arabic manuscripts of the al-Fawz al-Asghar and The Epistles of Ikhwan al-Safa were also available at the University of Cambridge by the 19th century. These works likely had an influence on 19th-century evolutionists, and possibly Charles Darwin.[citation needed]