Other and just as useful questions as electricity await our attention. Parts and uses of the human body, to-day are to us as little understood as electricity was at any time. The lung to-day is an unknown mystery, as to what its power and uses are; we only know that air goes in and out of the lungs; farther than that we are at sea. We have just as little knowledge of the heart as the lungs, we find a hollow fibrinous tank receiving and discharging blood; we are not prepared to say whether the corpuscle is formed in the heart or not; all else is conjectural and speculative on the subject the corpuscle. We see channels leading to and from it, to and from all parts of the body, muscles and glands. We know it moves when we are alive, we know it is silent in death. LOADED WITH IGNORANCE. We pass from there to the liver loaded down with ignorance, from what we know, cannot tell whether it is male or female, we simply know its size, location and something of its form and action, but nothing beyond conjecture. It stands to-day one of the wonders to him that tries to reason. LACK OF KNOWLEDGE OF THE KIDNEY. We will leave this organ of many pounds with an open confession of our ignorance and take up the kidney. At what time was the man and woman born that knew and left on record a true and reliable knowledge of the renal capsule. We do not know whether that is the organ that makes our teeth, our hair or generates a powerful acid by which lime is kept in solution, so as not to form stones and such deposits. HOW A PURGATIVE ACTS. Nature's method is simple and easily comprehended in delivering purgative medicines, with their softening powers to dry constipated fecal matter. For instance: We would give a purgative in the shape of salts, rhubarb, calomel and other substances of choice. The first question of the physician is how is this to pass through so densely packed substance or fecal matter which is in the bowels? At this time we will be short in the statement. The purgative poisons are taken up by the the secretions conveyed to the lymphatics. To soften and wash out is the object of nature. The lymphatics begin the work of washing out by starting action of the excretories and furnishes the water to soften, which is injected into the bowels from the mouth to the extremities by a system of salivation. FLUX (BLOODY DYSENTERY.)