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Cinchona bark

Letter from J Broughton, Government Quinologist, to Revenue Department, Government of Madras, 31 July 1871, analysing cinchona barks from different plantations in India. Letter from John Eliot Howard at Tottenham to Under Secretary of State for India, 16 January 1872, responding to Broughton’s report and recommending the red bark or cinchona succirubra as the most profitable kind to sell in London…