The one-sided genius is a link between the neurotic, the epileptic, the paranoiac, the hysteric, and the imbecile. Cases crop up in which all these elements are so mingled as to create a puzzle where they shall be placed. In some cases, in accordance with the general law that physiologic atrophy is accompanied by hypertrophy in other directions, the intellectual powers other than along certain lines may be remarkably deficient. Moreover, the intellectual power due to healthy atavism is increased by the degeneracy in certain directions. Without going into the question, raised by Lombroso,[257] as to genius being an epileptoid neurosis, sufficient evidence exists to show that ill-balanced genius often coexists with defects in a large number of directions. The coexistence of genius with imbecility and even idiocy has been well illustrated by Langdon Down, who cites numerous instances thereof.[258] Defect in genius, whether of the imbecile stamp or otherwise, accompanied by deficiency, is not expressed in the genius, but in its deficient accompaniment. Even the mental instability of the highest type of defective genius is closely akin to that of the neurotic. The hysterics, as has been shown by Des Champs,[259] are neurotic women in whom an aggravated sensibility exists. Neurotic women are divisible into three categories according to the predominance of one of three centres--cerebral, genital, and neuropathic. These types may be pure or intermixed. The general characteristics are an absolute want of equilibrium in sensibility and will power. There exists mobility of humour in direct relation with facile impressionability to external influences or to internal states. The nerves vibrate to all sentiments coming from within or without, and all are registered without proper relation. One fact chased by another is forgotten. Another produces a momentary hyperexcitation, which takes place of the truth, whence it is that falsehood is instinctive, but the patient protests her good faith if accused of the same. This lack of equilibrium leads to a decided modification of the mental faculties. Intellectual activity is over excited, but in diverse degrees and variable ways, according to the particular tendencies adopted. Absorbed by a preoccupation or controlled by an idea, they become indifferent to all else. Their ideas are abundant, and they rapidly pass from the idea to the act. Their vivid imagination, coupled with a bright intelligence, gives them a seducing aspect, but their judgment is singularly limited, attenuated, or false. They judge from a non-personal standpoint excellently. They are quick at discovering the faults of even their own relatives, but faults rightly attributed to themselves are repudiated. Their memory is capricious. They forget their faults and their acts under impulse, albeit these may be consciously done. The cerebral type is led by the intelligence. She has little or no