219. A very common occurrence with writing mediums is the change which takes place in their handwriting, according to the spirits who communicate; and what is still more remarkable, the same writing, which is often identical with the writing of the spirit while in the flesh, is reproduced whenever the same spirit communicates. This change of writing only occurs with mechanical and semi-mechanical mediums, because, in their case, the movement of the hand is involuntary and directed by the communicating spirit; it does not occur with merely intuitive mediums, because, in their case, the spirit acts only upon their thought, and their hand is directed by their own will, as in ordinary writing. But the non-occurrence of change in the character of the writing, even in the case of the mechanical medium, proves nothing against the reality of his faculty; such changes not being, by any means, a necessary condition of spirit manifestation, but merely the result of a special physical aptitude with which even the most purely mechanical writer is not always endowed (See Polygraphic Mediums, No 191).