In his book "Rejuvenation by Grafting" (1925), Voronoff describes what he believes are some of the potential effects of his surgery. While "not an aphrodisiac", he admits the sex drive may be improved. Other possible effects include better memory, the ability to work longer hours, the potential for no longer needing glasses (due to improvement of muscles around the eye), and the prolonging of life. Voronoff also speculates that the grafting surgery might be beneficial to people with "dementia praecox", the mental illness known today as schizophrenia.