Portion of Life, because the Element it self does so. Sec. 70. On the contrary, if there were any of these compounded Bodies, in which the Nature of one Element did not prevail over the rest, but they were all equally mix'd, and a match one for the other; then one of them would not abate the Force of the other, any more than its own Force is abated by it, but they would work upon one another with equal Power, and the Operation of any one of them would not be more conspicuous than that of the rest; and this Body would be far from being like to any one of the Elements, but would be as if it had nothing _contrary_ to its _Form,_ and consequently the more dispos'd for Life; and the greater this Equality of Temperature was, and by how much the more perfect, and further distant from inclining oneway or other, by so much the farther it is distant from having any contrary to it, and its Life is the more perfect. Now since that Animal Spirit which is seated in the Heart is of a most exact Temperature, as being finer than _Earth_ and _Water_, and grosser than _Fire_ and _Air_, it has the Nature of a Mean between them all, and which has no manifest Opposition to any of the Elements, and by this means is fitted to become that Form which constitutes an Animal. And he saw that it follow'd from hence, that those _Animal Spirits_ which were of the most even Temperature, were the best dispos'd for the most perfect Life in this World, of Generation and Corruption, and that this Spirit was very near having no opposite to its Forms, and did in this respect resemble the Heavenly Bodies which have no opposite to their Forms; and was therefore the Spirit of the Animal, because it was a Mean between all the Elements, and had no absolute Tendency, either upwards or downwards; but that, if it were possible it should be plac'd in the middle Space, between the Center and the highest Bounds of the Region of Fire, and not be destroy'd, it would continue in the same place, and move neither upwards nor downwards; but if it should be locally mov'd, it would move in a round, as the Heavenly Bodies do, and if it mov'd in its place, it would be round its own Center, and that it was impossible for it to be of any other Figure but Spherical, and for that reason it is very much like to the Heavenly Bodies.