Even such an obvious idea as to observe an animal with vertigo or to rotate an animal did not occur to him, in spite of the fact that he conducted numerous vertigo experiments with human subjects and made frequent use of animal experiments.
We think of medieval England as being a place of unbelievable cruelty and darkness and superstition. We think of it as all being about fair maidens in castles, and witch-burning, and a belief that the world was flat. Yet all these things are wrong.