sentences:  This period is narrated in his memoir "Trials in Burma".He gives special attention to the political trial of J. M. Sen Gupta, mayor of Calcutta, for sedition in impromptu speeches made during a brief visit to Rangoon in 1930; also to two criminal trials which became politically charged because they brought to light underlying attitudes of British merchants and army officers to Burmese people.Collis's judgments were (according to his own analysis) too independent to be pleasing to the then British Government of Burma, arousing the particular disapproval of his superior, Booth Gravely, Commissioner of the Pegu Division.