Getting back for a moment to hypnotizability and intelligence, which I was talking about earlier ...
I'm now reading "Hypnosis and Suggestion in Psychotherapy" by Hippolyte Bernheim, MD, which I found in a used book store (originally published in 1889).
On page 5, the author says, "It is wrong to believe that the subjects influenced are all weak-nerved, weak-brained, hysterical, or women. Most of my observations relate to men, whom I have chosen on purpose to controvert this belief.
....
I have hypnotized very intelligent people belonging to the higher grades of society, who were not in the least nervous, at any rate in the sense in which that word is commonly used."