To satisfy the mind of a philosopher who is mentally capable of asking for and knowing truth, when presented by nature, you must come at him outside of the limits of conjecture, and address him with self-evident truths only. When he takes up the philosophy of the great subject of life, to him who does know truth, no substitute can to any degree satisfy his mental demands. To the one who would deal in conjectures or suppose so's, he will at once be placed in the proper category to which he belongs, which is the drift-wood that floats down the dark river that is overshadowed by the nightmare of ignorance and superstition. A seeker after truth, is a man of few words, and they are used by him only by the truths or facts discovered. He has no patience with the unmeaning records offered only to please the credulous, and by those of little or no truth that appears during a long recitation of ungrounded statements. From the above it is wisely seen that the object of these remarks is to present a few truths for the purpose of stimulating the attention of the listener. We will take man when formed. When we use the word formed, we mean the whole building being complete. The brain with all organs, nerves, vessels, and every minutia in form with all materials found or used in life. BODY IN PERFECT HEALTH. We look at it in perfect health which means perfection and harmony not in part, but of the whole body. So far we are only filled with love, wonder and admiration. Another period of observation appears to the philosopher. We find partial or universal discord from the lowest observable to the highest in action and death. Then the book of whys is opened and displays its leaves which calls out mental labor even to the degree of agony, to know the cause or causes that produce a failure of a limb in sensation, motion, nutrition, voluntary and involuntary functional exhibits. His mind will explore the bone, the ligament, the muscle, the fascia, the channels through which the blood travels from heart to local destiny, with lymphatics and their contents,--the nerves, the blood vessels and every channel through or over which all substances are transmitted all over the body, particularly the disabled limb in question. It proceeds too and does obtain blood abundantly to and from the heart, but the results obtained are not satisfactory, and another leaf is opened of why no good results are obtained and where is the mystery, what quality and element of force and vitality has been withheld? A thought strikes him that the cerebro spinal fluid is the highest known element that is contained in the human body, and unless the brain furnishes this fluid in abundance a disabled condition of the body will remain. He who is able to reason will see that this great river of life must be tapped and the withering field irrigated at once, or the harvest of health be forever lost. CHEMISTRY.