Ch. 19.         265

The only thing to be desired is that the process of writing should be as easy as in the other cases, for the difficulty in this respect makes this method less recommendable.  Also, the nature of the Mode depending on this variation of characters appears from the subjoined table, constructed by de Vigenere,  p 238; which table likewise it suffices to put here without explanation, inasmuch as the method of using has already been sufficiently shown in what has preceded.