"And as these irritative ideas make up a part of the chain of our waking thoughts, introducing other ideas that engage our attention, though themselves are unattended to, we find it very difficult to investigate by what steps many of our hourly trains of ideas gain their admittance."
Zoonomia: or, The Laws of Organic Life [Vol. I]
<u>Zoonomia: or, The Laws of Organic Life</u>, vol. 1 (London: Printed for J. Johnson, 1794). &lt;<a href="http://name.umdl.umich.edu/004874881.0001.001">Link to ECCO-TCP</a>&gt; 