 For if we utterly forget, or cease to be conscious of having done many things in former Parts of our Lives which we certainly did, as much as any of those which we are conscious that we have done; and if in fact we do by degrees forget everything which we do not revive by frequent Recollection, and by again and again imprinting our decaying Ideas; and if there be in a determinate Time a partial or total flux of Particles in our Brains: What can better account for out total Forgetfulness of some things, our partial Forgetfulness of others, than to suppose that the Substance of the Brain in constant Flux? (Clarke 1738 [1928: 787 and 809]; Clarke and Collins 2011: 130)