In the human body something happens very similar to the deposit of scale in a steam boiler. But the human body is a furnace as well as an engine. It is so intricate and so delicate that if the temperature rises or falls one degree above or below normal, the condition is one of dis-ease. As food is its fuel, how can we expect the mechanism to remain in order if we utterly disregard the body's requirements, not only as to the character of the fuel supplied, but also as to the quantity, especially if we so choke it with fuel that Nature is unable to burn it up in the vital processes, and to dispose of the resulting ashes and cinders? Nature is resourceful--full of expedients and makeshifts! If she were not, the span of life would be much shorter than it is. As previously stated, she will seal up a foreign substance that cannot be expelled, and not only will she do this with solids that have penetrated the flesh, but she will actually build "catch basins" in the body, called cysts--bags, somewhat like a bladder, in which the excess or refuse that cannot be eliminated may be impounded, and the ruin of the body postponed for months or even for years. [Sidenote: True diagnosis locates a disorder; also the causes] The true office of diagnosis is not only to find the disorder, but to discover also the conditions that lead to it, or have a bearing upon it; hence that diagnosis is faulty which comes short of this, for the reason that even if the disorder be located and overcome, it will recur if its cause persists, just as the scale in the boiler will form again if the causes that produced it are not removed. As the blood is the life, as it brings to every cell life (nourishment), and carries away death (poisonous by-products of vital activities in the form of dead matter to be eliminated from the body); as it does this by its marvelously rapid circulation through every cell, it is obvious that every part of the body will be in a state of health if the blood itself is pure, and its supply and circulation such that every cell is abundantly fed. The supreme law of health, therefore, may be expressed in two statements, one positive and one negative: 1 Feed the body correctly 2 Do not interfere with the circulation of the blood [Sidenote: Both the storing of fat and the disposing of waste are expensive processes]