Full Idea
Locke assumes that one could have the concept of an individual without assigning it to any kind.
Gist of Idea
We can conceive an individual without assigning it to a kind
Source
report of John Locke (Essay Conc Human Understanding (2nd Ed) [1694]) by Nicholas Jolley - Leibniz and Locke on Essences p.205
Book Reference
'Leibniz: Critical and Interpretive Essays', ed/tr. Hooker,Michael [Manchester 1982], p.205
A Reaction
I'm not sure of the evidence for this, and Jolley says that Leibniz disagrees (in the Essaies). I cling to it because I take it to be correct. Identifying a kind seems to me to be a good way for us to get at an individual essence, but that is all.