260. Among the proofs of identity may also be classed the similarity of the writing and the signature, but, as it is not always given to all mediums to obtain this result, it is not always a sufficient guarantee ; there are forgers in the world of spirits as in this ; so that this is but presumptive evidence, which acquires value only by accompanying circumstances. It is the same with all material signs that some give as talismans that cannot be imitated by lying spirits. For those who dare perjure themselves in God's name, or counterfeit a signature, no material sign whatever will offer an obstacle. The best of all the proofs of identity is in the language and in casual circumstances.