James Mill, The History of British India, Third Edition, Baldwin, Cradock, and Joy, London, 1826, Volume 4, pp. 267--313 (Book V, Chapter 6)
I have included the material from paragraph 12 on so that the reader may see James Mill's description of the circumstances of the Hastings-Impey affair, starting with the decision by Parliament in 1774 to create a Supreme Court for Bengal with authority over the native courts and operating by British, and not Indian, law.