Full Idea
Memory is a different experience from consciousness, and Locke should not link them together, but should admit that his theory depends on memory.
Gist of Idea
Locke's theory confusingly tries to unite consciousness and memory
Source
comment on John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.27.10) by Thomas Reid - Essays on Intellectual Powers 3: Memory Ch 6
Book Reference
'Personal Identity', ed/tr. Perry,John [University of California 1975], p.115
A Reaction
Interpreters of Locke over-emphasise memory. He thought that, effectively, a person IS a consciousness, and only got interested in memory as a way of extending consciousness across time. Then the epistemology of memory got him into trouble.