extremities, if deprived of the influence of any one group of the ruling organs, are converted not only into useless but lifeless masses. Of the skin, muscles, and bones, which compose the head, neck, and trunk of the body, the same is true. Of themselves they possess no character, and can therefore bestow none. They also are but appendages to the organs they cover, affording them a secure lodgment and protection from external injuries, and aiding them in the performance of some of their functions. And from this alone is their importance derived. Were it possible for them to exist apart from the viscera they contain, their grade of being would be below that of many vegetables. Most fatal diseases, moreover, have their original seat in the viscera of one of the three great cavities of the body, and no disease originating elsewhere can become fatal, until, by sympathy or metastasis, some of those parts are deeply affected. To enlightened physiologists this statement presents but a series of familiar truths. To the groups of organs exclusively, then, I repeat, contained in the abdomen, the thorax, and the cranium, must we look as the main source of human character. And that character is different according to the predominance, in different individuals, of one group or another, or of any two of them. An equilibrium between the three groups constitutes another variety, by bestowing on character a corresponding equilibrium. Let the word _temperament_ be substituted for 'character,' and what is true of the latter will be so of the former. As already mentioned, the organs referred to will be its source; and the differences in their predominance will give diversity to it." Dr. C. then shows that the strength and perfection of each of the senses are proportioned to the size of the nerve on which that sense depends. This is illustrated by a powerful array of facts, drawn from different orders of the animal kingdom, as well as from the different varieties of mankind. It is also stated, that where any nerve or set of nerves, is peculiarly large, the portion of the brain to which they belong, and by which they are influenced and commanded, is correspondingly large. "Inasmuch, then, as, other things being equal, size gives power to everything else, we are not only justified in believing, on grounds of analogy we are compelled to believe, that the same is true of the organs contained in the cranium, the thorax, and the abdomen. When they are in a sound and natural condition, their size is also the measure of their power. Were not this the case, they would be either altogether abnormal, or subject to laws that govern no other kind of matter, whether organic or inorganic, of which we have any knowledge. But the position I am contending for is not to be regarded as a mere inference in a process of reasoning. It will appear hereafter that it is a positive fact, which observation has discovered, and continues to confirm.