So it is far from true that this mentality has no connection with ours. Our logic was born of this logic. The explanations of contemporary science are surer of being objective because they are more methodical and because they rest on more carefully controlled observations, but they do not differ in nature from those which satisfy primitive thought. To-day, as formerly, to explain is to show how one thing participates in one or several others. It has been said that the participations of this sort implied by the mythologies violate the principle of contradiction and that they are by that opposed to those implied by scientific explanations.[736] Is not the statement that a man is a kangaroo or the sun a bird, equal to identifying the two with each other? But our manner of thought is not different when we say of heat that it is a movement, or of light that it is a vibration of the ether, etc. Every time that we unite heterogeneous terms by an internal bond, we forcibly identify contraries. Of course the terms we unite are not those which the Australian brings together; we choose them according to different criteria and for different reasons; but the processes by which the mind puts them in connection do not differ essentially. It is true that if primitive thought had that sort of general and systematic indifference to contradictions which has been attributed to it,[737] it would be in open contradiction on this point with modern thought, which is always careful to remain consistent with itself. But we do not believe that it is possible to characterize the mentality of inferior societies by a single and exclusive inclination for indistinction. If the primitive confounds things which we distinguish, he also distinguishes things which we connect together, and he even conceives these distinctions in the form of sharp and clear-cut oppositions. Between two things which are classified in two different phratries, there is not only separation, but even antagonism.[738] For this reason, the same Australian who confounds the sun and the white cockatoo, opposes this latter to the black cockatoo as to its contrary. The two seem to him to belong to two separate classes between which there is nothing in common. A still more marked opposition is that existing between sacred things and profane things. They repel and contradict each other with so much force that the mind refuses to think of them at the same time. They mutually expel each other from the consciousness.