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Concern for the reformers Thomas Muir, Thomas Fyshe Palmer and William Skirving led him to visit them as convicts on board the hulks, when awaiting transportation, and he sent papers and pamphlets to them in New South Wales.
There is an obelisk, the "Scottish Political Martyrs Memorial", the second monument (the other is in Edinburgh) dedicated to the leaders of the Friends of the People Society, popularly called the Scottish Martyrs, including Thomas Muir, Maurice Margarot, and Thomas Fyshe Palmer, who were transported to Australia in 1794.