Full Idea
There are no positive or negative facts. 'Positive' and 'negative' refer to the form of propositions, and not to the facts which verify or falsify them.
Gist of Idea
There are no positive or negative facts; these are just the forms of propositions
Source
Ludwig Wittgenstein (Lectures 1930-32 (student notes) [1931], C XIII)
Book Reference
Wittgenstein,Ludwig: 'Lectures in Cambridge 1930-32', ed/tr. Lee,Desmond [Blackwell 1980], p.93
A Reaction
Personally I think if we are going to allow the world to be full of 'facts', then there are negative, conjunctive, disjunctive and hypothetical facts.