In 1781 he founded a society in Bridgetown similar to the London Society of Arts, in order to change the treatment of the slave population, and soon after that became a member of the council for the island.
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Joshua Steele's disagreement, and subsequent correspondence, with Monboddo over details of the "melody and measure of speech" resulted in Steele's Prosodia Rationalis, a foundational work both in phonetics and in the analysis of verse rhythm.