 Warlingham Park Hospital, Croydon, Surrey, started to experiment with psychosurgery soon after the Burden Neurological Institute and published the results of their first four operations in the same issue of "The Lancet".One patient died.Surgeon John Crumbie designed his own leucotome (instrument for cutting the white matter in the brain) which was constructed by Warlingham's assistant clerk of works, and referred to by Wylie McKissock, who operated with a Cushing brain needle, as a "mechanical egg-whisk".