“But what shall we say of that principle of intelligence which pervades every part of this complicated system; which dwells in each of the thousand millions of cells, where the chemical laboratories are furnishing out of the crude materials of the food, the wonderful organisms of every part of the body? Intelligence and contrivance reign in every cell; combination and co-operation are carried on through the instrumentality of the nervous system. At the centres of co-operation and power there seem to be placed higher forms of intelligence that govern the whole of the subordinate functions by some unitary plan governing thus the functions of the heart, or the liver, or the lungs. Finally, for the moral and social exigencies of man, there is provided an enormous centralization of co-operative intelligences and powers, that seem to have their seat in the brain; but it is a republic and not a monarchy; every individual cell in the body has its representative there, mediately or immediately; every one contributes to the welfare of the whole, and can not be denied its rights, or be neglectful of its duties, without injury, in that proportion, to the whole republic. “There is a subtle and indefinable health beyond that of the stomach and muscular powers; a man may be torpid in moral brain and intellectual functions, who yet has an excellent appetite and can do the work of an ox.[9] This is not usually regarded as sickness, or needing any physiological treatment. But it is as much so as the grossest form of sickness. A man’s temper and disposition may be the only evidence that his liver is out of order. A paroxysm of rage may come from a diseased spleen, and many a murder, arson, and suicide, I doubt not, come from a defective hygiene. [Footnote 9: Others, again, are physically as well as mentally impotent, while eating enormously, “the digestion and excretion of superfluous food almost monopolizing the vital energy.”] “Physiology is an integral part of theology. Sanitary reforms lie at the foundation of moral reforms. Christianity is health, and the means of escaping from disease. “No delusion is so vain as to suppose that this world is ever to be Christianized, society purified and exalted, man saved and brought to the divine likeness, while a thousand forms of disease prey upon his vitals, cloud his moral perceptions, enfeeble or exasperate his will, overwhelm him with pain and confusion, even in the midst of his noblest designs; and all this, because he knows not, or respects not sufficiently, the laws of his physical nature; the subtle powers and mechanism of which are as divine in their origin and inflexible in their character as any that govern the soul.”