Edinger suggested that he investigated the experimental model of Friedrich Leopold Goltz (1834–1902), which was a dog who had had its brain extirpated, saying "I can't make anything of it!" It is possible that this experimental animal may have aroused his initial interest in the cerebellum. He said, "I might have become a German" for there was an effort to create a post for him in Frankfurt, but Ehrlich had just commenced his work on Salvarsan and it was decided that the money over the next two years go to that work. Holmes therefore returned to London and became a resident medical officer at the National Hospital for Nervous Diseases in Queen Square, under John Hughlings Jackson (1835–1911), the doyen of British neurologists. Around this time, he published a paper detailing Holmes tremor and a phenomenon later known as the Holmes rebound phenomenon.