To the celebrated French alienist, Esquirol, is due the signal merit of having discovered that there are forms of mental derangement in which thought proceeds apparently in a perfectly rational manner, but in which, in the midst of intelligent and logical cerebral activity, some insane presentations appear, like erratic boulders, thus enabling us to recognise the subject as mentally diseased. But Esquirol has committed the fault of not digging deep enough; his observation is too much on the surface. It was through this that he came to introduce into science the notion of ‘monomania,’ that is, of well-delimitated, partial madness, of an isolated, fixed idea beside which all the rest of the intellectual life operates with sanity. This was an error. There is no monomania. Esquirol’s own pupil, the elder Falret, has sufficiently proved it, and our Westphal, from whose other merits I have no wish to detract, was far from standing in the forefront of research, when, half a century after Esquirol, and thirty years after Falret, he still described the ‘fear of space,’ or agoraphobia, as a special mental malady, or kind of monomania. What is apparently monomania is in reality an indication of a profound organic disorder which never reveals itself by one single phase of folly. A fixed idea never exists in isolation.[230] It is always accompanied by other irregularities of thought and feeling, which, it is true, at a cursory glance, may not be so distinctly remarked as the more strongly developed insane idea. Recent clinical observation has discovered a long series of similar fixed ideas or ‘monomanias,’ and recognised the fact that they are one and all the consequence of a fundamental disposition of the organism, viz., of its degeneration. It was unnecessary for Magnan to give a special name to each symptom of degeneration, and to draw up in array, with almost comical effect, the host of ‘phobias’ and ‘manias.’ Agoraphobia (fear of open space), claustrophobia (fear of enclosed space), rupophobia (fear of dirt), iophobia (fear of poison), nosophobia (fear of sickness), aichmophobia (fear of pointed objects), belenophobia (fear of needles), cremnophobia (fear of abysses), trichophobia (fear of hair), onomatomania (folly of words or names), pyromania (incendiary madness), kleptomania (madness for theft), dipsomania (madness for drink), erotomania (love madness), arithmomania (madness of numbers), oniomania (madness for buying), etc. This list might be lengthened at pleasure, and enriched by nearly all the roots of the Greek dictionary. It is simply philologico-medical trifling. None of the disorders discovered and described by Magnan and his pupils, and decorated with a sonorous Greek name, forms an independent entity, and appears separately; and Morel is right in disregarding as unessential all these varied manifestations of a morbid cerebral activity, and adhering to the principal phenomenon