Coincidences of this sort have a great effect on savage minds. Catlin, the friend of the Mandan tribe, mentions a chief who consolidated his power by aid of a little arsenic, bought from the whites. The chief used to prophesy the sudden death of his opponents, which always occurred at the time indicated. The natural results of the administration of arsenic were attributed by the barbarous people to supernatural powers in the possession of the chief.(1) Thus the philosophy of savages seeks causas cognoscere rerum, like the philosophy of civilised men, but it flies hastily to a hypothesis of "supernatural" causes which are only guessed at, and are incapable of demonstration. This frame of mind prevails still in civilised countries, as the Bishop of Nantes showed when, in 1846, he attributed the floods of the Loire to "the excesses of the press and the general disregard of Sunday". That "supernatural" causes exist and may operate, it is not at all our intention to deny. But the habit of looking everywhere for such causes, and of assuming their interference at will, is the main characteristic of savage speculation. The peculiarity of the savage is that he thinks human agents can work supernaturally, whereas even the Bishop reserved his supernatural explanations for the Deity. On this belief in man's power to affect events beyond the limits of natural possibility is based the whole theory of MAGIC, the whole power of sorcerers. That theory, again, finds incessant expression in myth, and therefore deserves our attention. (1) Catlin, Letters, ii. 117.