"But neither can any such tablet be found in the brain, nor any style, by which to make the characters upon it; and though some of the more simple phænomena of ideas, as their being more or less deeply impressed, their being retained a longer or or a shorter time, being capable of being revived at pleasure, &c. may be pretty well explained by the hypothesis of such a tablet, and characters upon it, it is wholly inadequate to the explanation of other, and very remarkable phænomena of ideas, especially their mutual association."
Hartley's Theory of the Human Mind, on the Principle of the Association of Ideas; with Essays Relating to the Subject of It
At least 4 entries in ECCO and ESTC (1775, 1776, 1790).<br>
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See <u>Hartley’s Theory of the Human Mind, on the Principle of the Association of Ideas; With Essays Relating to the Subject of It. By Joseph Priestley, LL. D. F. R. S.</u> (London: Printed for J. Johnson, No. 72, St. Paul’s Church-Yard, 1775). &lt;<a href="http://estc.bl.uk/T141560">Link to ESTC</a>&gt;