In the “Journal” for October, 1881, I recorded a case of feigned insanity in a prisoner who was charged with the crime of murder. The form of mental disorder assumed in that case was acute mania; and the pourtrayment was so good that even the experienced prison officials, who are accustomed with attempts at imposture in all its varieties, were deceived by his histrionic skill. The following case differs in many of its aspects from that one, but it resembles it in respect that the prisoner ultimately confessed his imposition; though, as in the former case, not till after the distinct expression of medical opinion that he was malingering.