In fact, about one-half of all mental diseases can be attributed to such physical causes as brain lesions, alcohol, toxins and injuries. But the other half—and this is the appalling part of the story—the other half of the people who go insane apparently have nothing organically wrong with their brain cells. In post-mortem examinations, when their brain tissues are studied under the highest-powered microscopes, these tissues are found to be apparently just as healthy as yours and mine.
