Full Idea
We cannot take a token of a word to be an occurrence of it. Suppose there is exactly one occurrence of the word 'etherized' in the whole of English poetry? Exactly one 'token'? This sort of occurrence is like the occurrence of a number in a sequence.
Gist of Idea
A token isn't a unique occurrence, as the case of a word or a number shows
Source
Richard Cartwright (Propositions [1962], Add 2)
Book Reference
Cartwright,Richard: 'Philosophical Essays' [MIT 1987], p.53
A Reaction
This remark is in an addendum to his paper, criticising his own lax use of the idea of 'token' in the actual paper. The example nicely shows that the type/token distinction isn't neat and tidy - though I consider it very useful.