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Mason that 'You [Mason] have been left at Chinkiang not because you have been overlooked, but because you have shown a particular proficiency in acquiring the Nanking dialect, and I did not wish to interrupt these studies by transferring you to another province. It is also important for me to train certain men in the intricate business of Transit Passes40 peculiar to Chinkiang alone, and I have been pleased with your mastery of this branch of our work'.
For the next couple of months Mason's name crops up in some dozen or so of Hart's letters, usually towards the end of a letter on, what were to Hart, weightier matters. Such comments included 'The Yamen finds "Mason Affair" very handy: it can now return the Legation fire neatly after last summer's bombardment sustained for the riots, etc.
Mason was brought to trial in the British Supreme Court before the British Consul-General and the Shanghai Settlement's Chief Judge, N J Hannen, on 29 October 1891, charged simply with the illegal possession of dynamite to which he pleaded guilty. Although he had declared before and after the trial that he was a member of the Gelao Hui, had acted to further its plans to overthrow its government, and had personally brought the dynamite into China with unlawful intent, these facts were not mentioned at the trial nor did the Chinese government produce any evidence. The Chinese Legation in London later exerted pressure to demand that Mason, on his release from prison in Shanghai, be tried in Hong Kong on charges of crimes and conspiracy against the Chinese state. Mason was, however, not tried again.
Hart, at one point, refers to Mason's comrade Croskey who Mason himself mentioned in his "Confessions" as a spy, put there by the Customs Service to watch Mason and who, according to Mason, betrayed and ruined him. In practice Croskey had been promoted from the outdoor staff to the indoor, and then posted to Zhenjiang. Mason somewhat naively explained his plans and plots to Croskey shortly after they met, and Croskey informed his boss in Zhenjiang who in turn asked Croskey to learn more about Mason's plan. Croskey resigned from the Service in the November 'on Sir Robert Hart's recommendation'. Croskey, according to Hart, was a promising young American citizen, a grandson of the first Sir Thos. Bazley, a Manchester MP.41