Two cases are covered by Dr. Myers. The first case is of Louis V. He suffered from epilepsy, hysteria and paralysis after a great fright from a viper. His memory would occasionally relapse back to a previous time period. Later in life he would oscillate back and forth between two personalities. Each personality seemed to be controlled by a different side of the brain. The second case is that of Felidia X. She suffered from the presence of a second personality. She was able to function in both of these states due to being put into a hypnotic trance. Dr. Myers compares the two cases on the grounds of morals vs. biology.
Dr. Myers discusses the case of Louis V. His case is compared to that of Felida X. Louis V. ‘s 2nd personality emerged after a scare with a viper. He developed other personalities due to various causes after that point. In all he is said to have six separate personalities. Some of these personalities also suffer from paralysis or epilepsy, some are gentle, other resort to thievery and mischief. Dr. Myers includes a chart to show the differences between the personalities.