If, finally, we consider genius from the somatic side, we find it conditioned by several anatomical and physiological qualities, which individually are seldom present in perfection, and still more seldom perfect together, but which are yet all indispensably required; so that this explains why genius only appears as a perfectly isolated and almost portentous exception. The fundamental condition is an abnormal predominance of sensibility over irritability and reproductive power; and what makes the matter more difficult, this must take place in a male body. (Women may have great talent, but no genius, for they always remain subjective.) Similarly the cerebral system must be perfectly separated from the ganglion system by complete isolation, so that it stands in complete opposition to the latter; and thus the brain pursues its parasitic life on the organism in a very decided, isolated, powerful, and independent manner. Certainly it will thereby very easily affect the rest of the organism injuriously, and through its heightened life and ceaseless activity wear it out prematurely, unless it is itself possessed of energetic vital force and a good constitution: thus the latter belong to the conditions of genius. Indeed even a good stomach is a condition on account of the special and close agreement of this part with the brain. But chiefly the brain must be of unusual development and magnitude, especially broad and high. On the other hand, its depth will be inferior, and the cerebrum will abnormally preponderate in proportion to the cerebellum. Without doubt much depends upon the configuration of the brain as a whole and in its parts; but our knowledge is not yet sufficient to determine this accurately, although we easily recognise the form of skull that indicates a noble and lofty intelligence. The texture of the mass of the brain must be of extreme fineness and perfection, and consist of the purest, most concentrated, tenderest, and most excitable nerve-substance; certainly the quantitative proportion of the white to the grey matter has a decided influence, which, how-
