"It is his purpose in this Work, on the one hand, to exhibit, he does not say, a correct map, but a tolerable sketch of the human mind; and aided by the lights which the poet and the orator so amply furnish, to disclose its secret movements, tracing its principal channels of perception and action, as near as possible, to their source: and, on the other hand, from the science of human nature, to ascertain, with greater precision, the radical principles of that art, whose object it is, by the use of language, to operate on the soul of the hearer, in the way of informing, convincing, pleasing, moving, or persuading."
The Philosophy of Rhetoric
Only 1 entry in ESTC (1776).<br>
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<u>The Philosophy of Rhetoric. By George Campbell</u>, 2 vols. (London: Printed for W. Strahan; and T. Cadell, 1776). &lt;<a href="http://estc.bl.uk/T145750">Link to ESTC</a>&gt;