The Speech of Sir Elijah Impey ... Delivered by Him at the Bar of the House of Commons, on the Fourth Day of February, 1788: Being the Matter of His Defence to the First Article of Charge, &c. Exhibited to that House by Sir Gilbert Elliot, Bart. on the Twelfth Day of December, 1787. Together with Accurate Copies of the Several Documents Referred to in the Speech, and a Complete Copy of All the Evidence Received by the Committee of the Whole House to which the Articles Were Referred