But if the more modern writers on this subject have been less hampered by unanswerable and impassable dogmas; if they have been able to believe that there may be some difficult questions upon which the Bible throws no light; if they have felt themselves free to discuss, without impiety, the possibility of all mankind not having sprung from one pair, their theories are scarcely less wild, their reasoning is but little sounder, their tendency to establish maxims by which any given problem may be solved is no more satisfactory. [Sidenote: SPIRIT OF INQUIRY.] Theories in themselves are good things, for they lead us to facts; it is often through the doubtful or the false that we attain the truth; as Darwin says: "False facts are highly injurious to the progress of science, for they often long endure; but false views, if supported by some evidence, do little harm, as every one takes a salutary pleasure in proving their falseness; and when this is done, one path towards error is closed, and the truth is often at the same time opened."[I-5] But the value of inquiry depends much upon the spirit in which it is made, and therefore it is that the manner in which most of the writers who have speculated on the origin of the Americans have conducted their researches, is greatly to be deplored. Their work does not impress one as being a steadfast striving to develop unstable postulates into proven facts, but rather as a reckless rushing, regardless of all obstacles, to a preconceived conclusion. They do not offer a theory as a suggestion of what might possibly be, but as a demonstration founded upon an unassailable basis. Each imagines that he has hit upon the truth, the whole truth, and nothing but the truth; he asserts that the Aztecs were of Hebrew descent--that is settled; to prove this he clutches at the lightest straws in the way of analogies, and if the facts obstinately refuse to fit his theory, then--_tant pis pour les faits_--he warps them till they do fit. But analogies, even when fairly drawn, are by no means conclusive evidence. So much depends upon the environment of a people, that a similarity in that particular is of itself sufficient to account for most of the resemblances which have been discovered between the customs, religion, and traditions of the Americans, and those of Old World nations.[I-6]