As neither of these two great research scientists was able to find the solution to the mystery, it is small wonder that none of their contemporaries were able to do so either.

I am convinced that people with such wounds will be quite ready to co-operate in a safe and painless experiment in the interests of humanity as a whole.

As soon as I had proved this and, of course, also the normal pointing action and reactions in all other extremities and joints, I stopped the experiment.

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.