Full Idea
We have nothing else to refer these our ideas of mixed modes to as standard, to which we would conform them, but the ideas of those who are thought to use those names in their most proper significations.
Clarification
Locke's 'mixed modes' are complex ideas built up from simple ones
Gist of Idea
For the correct reference of complex ideas, we can only refer to experts
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.32.12)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.388
A Reaction
This is Putnam's thought about elm trees, that he uses the word 'elm' to refer to something the reference of which is fixed by experts on trees, and not by his ignorant self.