You are only about a hundred years too late with that assertion. Name one mechanism necessary for evolution that is not subject to direct experimentation.
Don't tell me we don't know everything already. That's a given.
Your assertion is that experimentation is not possible.
Well I don't know about you but when I read a book on evolution, the phrases "seems to" or "would seem that" comes up alot. As far as pointing out a mechanism, you base your statement on an assertion that evolution is scientifically provable. To date I have seen no experiment that proved that evolution (macro-evolution actually occurs.