A case recorded by Sérieux is instructive as regards the development of the sexual impulse, although it comes within the sphere of mental disorder. A woman of 32 with bad heredity had in childhood had weak health and become shy, silent, and fond of solitude, teased by her companions and finding consolation in hard work. Though very emotional, she never, even in the vaguest form, experienced any of those feelings and aspirations which reveal the presence of the sexual impulse. She had no love of dancing and was indifferent to any embraces she might chance to receive from young men. She never masturbated or showed inverted feelings. At the age of 23 she married. She still, however, experienced no sexual feelings; twice only she felt a faint sensation of pleasure. A child was born, but her home was unhappy on account of her husband's drunken habits. He died and she worked hard for her own living and the support of her mother. Then at the age of 31 a new phase occurs in her life: she falls in love with the master of her workshop. It was at first a purely psychic affection, without any mixture of physical elements; it was enough to see him, and she trembled when she touched anything that belonged to him. She was constantly thinking about him; she loved him for his eyes, which seemed to her those of her own child, and especially for his intelligence. Gradually, however, the lower nervous centers began to take part in these emotions; one day in passing her the master chanced to touch her shoulder; this contact was sufficient to produce sexual turgescence. She began to masturbate daily, thinking of her master, and for the first time in her life she desired coitus. She evoked the image of her master so constantly and vividly that at last hallucinations of sight, touch, and hearing appeared, and it seemed to her that he was present. These hallucinations were only with difficulty dissipated. (P. Sérieux, _Les Anomalies de L'Instinct Sexuel_, 1888, p. 50.) This case presents in an insane form a phenomenon which is certainly by no means uncommon and is very significant. Up to the age of 31 we should certainly have been forced to conclude that this woman was sexually anesthetic to an almost absolute degree. In reality, we see this was by no means the case. Weak health, hard work, and a brutal husband had prolonged the latency of the sexual emotions; but they were there, ready to explode with even insane intensity (this being due to the unsound heredity) in the presence of a man who appealed to these emotions.