To classify the biblical mythi according to these several distinctions is a difficult task, since the mythus which is purely symbolical wears the semblance of history equally with the mythus which represents an actual occurrence. These critics however laid down rules by which the different mythi might be distinguished. The first essential is, they say, to determine whether the narrative have a distinct object, and what that object is. Where no object, for the sake of which the legend might have been invented, is discoverable, every one would pronounce the mythus to be historical. But if all the principal circumstances of the narrative concur to symbolize a particular truth, this undoubtedly was the object of the narrative, and the mythus is philosophical. The blending of the historical and philosophical mythus is particularly to be recognised when we can detect in the narrative an attempt to derive events from their causes. In many instances the existence of an historical foundation is proved also by independent testimony; sometimes certain particulars in the mythus are intimately connected with known genuine history, or bear in themselves undeniable and inherent characteristics of probability: so that the critic, while he rejects the external form, may yet retain the groundwork as historical. The poetical mythus is the most difficult to distinguish, and Bauer gives only a negative criterion. When the narrative is so wonderful on the one hand as to exclude the possibility of its being a detail of facts, and when on the other it discovers no attempt to symbolize a particular thought, it may be suspected that the entire narrative owes its birth to the imagination of the poet. Schelling particularly remarks on the unartificial and spontaneous origin of mythi in general. The unhistorical which is interwoven with the matters of fact in the historical mythus is not, he observes, the artistical product of design and invention. It has on the contrary glided in of itself, as it were, in the lapse of time and in the course of transmission. And, speaking of philosophical mythi, he says: the sages of antiquity clothed their ideas in an historical garb, not only in order to accommodate those ideas to the apprehension of a people who must be awakened by sensible impressions, but also on their own account: deficient themselves in clear abstract ideas, and in ability to give expression to their dim conceptions, they sought to illumine what was obscure in their representations by means of sensible imagery. [42]