Sexual Life: Capgras. Autobiographie d'un Pervers Erotique. L'Encéphale, 1921, No. 7, p. 367.

The author records the case of a man with a life-long conscious incestuous fixation, so strong that onanism was invariably associated with phantasies about his sister and undisguised sexual dreams were always about her. In letters to her he gloated over the time when they slept in the same room (1861–74) and admired her charms. He confessed to her that in 1878 (when he was 24) he pierced a hole in the partition between their rooms in order to adore her naked body.

A year later he became alarmed at this passion for his sister and fled, taking a situation distant from Paris, where they had hitherto lived, and he did not see her again until he was 49. During these 24 years he resisted his incestual desires, realizing them in imagination only and abandoning himself to sensual reveries in which his sister was the sole object. On rare occasions he sought sexual relief with other women, but could only achieve an orgasm by picturing the face and body of his sister and pronouncing her Christian name. From 1895 to 1901 he wrote her many love letters of a grossly sexual character, even asking her to send him a pair of drawers she had worn. He asked the measurements of her chest, hips and thighs so that he might have a mannequin made to her measurements to love and adore. He appears to have achieved this object.

In a letter of 1901 he made a proposal of incestuous congress with his sister. This she declined but, in 1903, supposing that he was restored to the normal, allowed him to stay at her house. They had not seen each other for more than 20 years and he stayed one night, but fled from temptation the following morning, explaining in a subsequent letter that, although their bodies had grown old, 'mes rêves intimes pour toi etaient restés jeunes'. In 1905 he became impotent, but still loved his sister in dreams.

In 1913, suffering from arterial and auditory sclerosis; auditory