The Diabolical Dr. Z is a 1965 French Spanish horror film. This was Jesús Franco's last black and white movie. I can't find this either dubbed or with English subtitles, and now the one I watched has been taken down, but I'm still looking....
How can you resist?
DVD Talk calls it "a decent little genre film" and says, "parts of it are executed quite brilliantly". Horrorpedia has some still shots. TCM has information.
Because this blog does not consist of a single focus topic I chose the name Divers and Sundry where "Divers" means being of many and various kinds, and "Sundry" means consisting of a haphazard assortment of different kinds.