Penny S: Kettlewell's experiment is still taught in the OU's Darwin and Evolution level 1 course.

Kettlewell's experiment was actually looking at predation by birds on the moths. The increase of melanic moths in industrial areas was first noticed in 1848 and had been studied for around sixty years before Kettlewell was even born, and the hypothesis that the change in morphotypes in the peppered moth population was due to natural selection had been proposed during that time; Kettlewell set out to prove it was bird predation driving the process.

Which he did.