The limits of the power of the mind over the body are not known, but with knowledge it ever enlarges its boundaries. The class of diseases which may be regarded as essentially corporal, as the previously mentioned contagions produced by microbes, the effects of ptomaines, and the mineral and vegetable poisons, has its limits contracted by mental influences. Individuals in the most terrible contagions, although in contact with the sick and dying, physicians, nurses or companions, are often exempt. Their systems do not furnish the necessary conditions for growth of the disease germs. Such individuals are fearless; and it is said that their indifference to danger is their shield of protection; yet it is often the case that when they become exhausted by excessive care, they fall victims. This conclusion, however, may be safely drawn, that there are conditions of body or mind, or of both, invulnerable to disease. What these conditions are we may not now know, but it is possible to know. In these cases of purely physical disease, the body reacts on the mind, and the giving way of the will is the first indication of the approach of the malady. It is folly to talk of the will overcoming a disease that has insidiously sapped its foundation. This is not saying that were the wrong conditions of living righted, and the taints of heredity eliminated, the power of the will would not be able to maintain the body against all succeeding influences. But to reach that perfect state will require many generations of rightly directed culture. If grief, anger, or excessive joy are able to vitiate secretions, and cause sickness and death, a happy frame of mind, intellectual exertion and moral excellence tend to the perfect health of these secretions. Health is a condition to be gained and kept by careful observance of its laws, and these laws are of the physical as well as mental being. Whatever truth there is in these newly named theories of healing, is identically the same as that claimed by the mesmerists and magnetists. The process, the cause and effect, are the same under the name of Christian Science as that of mesmerism. In the large class of diseases called nervous, the soothing influence of another mind is of unmeasured benefit. Even the hope aroused that some mind is exciting its will to relieve, is beneficial. The strengthened will and imagination are wonderfully healing agencies. While the influence of the mind over the body is admitted without contradiction so long as the former is connected with the latter, the limitations of the physical world must be felt. There is a sickness of the mind, and of the body, and over the latter the mind has not full control. Yet with a race freed from hereditary taint, having for generations obeyed the laws of health until its conditions are fixed by heredity, it may not be said what the power of the mind may be.