That is exactly how scientific discoveries are made, we have a theory, do an experiment. Some prove our theory some do not. That is what happens in a reasearch and developement lab.
That's completely wrong, and actually serves as ironic proof that explains why Dawkins felt the need to write those pages...
Kate, since you seem not to take Doctor Dawkins' word for it, here's a free PDF download from the National Center for Science Education that explains the difference between the terms 'theory' and 'hypothesis', written by Eugenie Scott, a U.S. scientist who heads up the NCSE (an organization that advocates on behalf of science education in schools):