The greater part of his subsequent history is equally unedifying: having made the world his prey, he says that God made the world to that end, and those who have preyed upon their fellows, and enslaved them, and flourished upon it, have declared that to have been the intention of nature. (_The Metaphysics of Nature_; pp. 344-5). A perpetual pulling down and building up, and the building altogether dependent upon the demolition. The tiger built with tastes and capacities for catching the gazelle: the gazelle built with capacities that enable it to escape the tiger. There is no evidence here of the existence of a single mind working out an intelligent plan. At most we have either the proof for a number of warring powers, each one striving to destroy what the other is striving to create, or a single mind that has deliberately fashioned things so that each part may work for the destruction of the other part, the whole to presently end in a grand catastrophe. But that is not all. If we limit our attention to man, can it be said that we find in the human structure what we might reasonably expect to find if man be indeed the crown of the divine plan, the event to which, for untold ages, all things were designedly tending? What we actually do find is that the structure of man, physically and mentally, is such as to altogether negative the notion of complete or harmonious adjustment to environment. That the human has within it a large number of vestigial structures--some scientists place it as high as one hundred and seventy--is now well known, and forms at the same time one of the evidences of evolution and an impeachment of the theistic theory. There is only need to instance now the vermiform appendage, which forms the seat of appendicitis, the "wisdom" teeth, of very little use, and one of the most fruitful of causes of disease of the teeth, the hair which covers the human body, now of no use whatever, except to form a lodgment for microbes, and so makes the acquisition of disease the more certain. In addition to the number of rudimentary organs that actually encourage disease--Metchnikoff counts among these the larger intestine--the body is full of rudimentary muscles and structures that when not positively harmful, impose a tax on the organism for which no corresponding service is performed.