In the later and enlarged edition of his work, he lays much stress upon the point that the cipher 'should be free from suspicion,' for he says, 'if a letter should come into the hands of such as have a power over the writer or receiver, though the cipher itself be trusty and impossible to decipher, it is still subject to _examination_ and _question_, and (as he says himself), 'to _avoid all suspicion_,' he introduces there a cipher in _letters_, which he invented in his youth in Paris, 'having the highest perfection of a cipher, that of signifying _omnia per omnia_;' and for the same reason perhaps, that of 'avoiding all suspicion,' he quite omits there that very remarkable passage in the earlier work, in which he treats it as a medium of _tradition_, and takes pains to intimate his reasons for producing it in that connection, _with the principal and supreme sciences_. If it was, indeed, any object with him to avoid suspicion, and recent disclosures had then, perhaps, tended to sharpen somewhat the contemporary criticism; he _did well_, unquestionably, to omit that passage. But at the time when _that_ was written, he appears to be chiefly inclined to notice the remarkable facilities, which this style offers to an inventive genius. For he says, 'in regard of the rawness and unskilfulness of _the hands through which they pass_, the greatest matters, are sometimes carried in the _weakest ciphers_.' And that there may be no difficulty or mistake as to the reading of that passage, he immediately adds, 'In the enumeration of these private and retired arts, it may be thought I _seek to make a great muster-roll of sciences_, naming them for _show_ and _ostentation_, and _to little other purpose_. But'--note it--'But, let those which are _skilful in them judge, whether I bring them in only for appearance_, or whether, in that which I speak of them, though in few words, there be not _some seed of proficience_. And this must be remembered, that as there be many of great account in their countries and provinces, which, when they come up to the _seat of the estate_, are but of mean rank, and scarcely regarded; so these arts, ("these private and retired arts,") being here placed _with the principal and supreme sciences, seem_ petty things, YET TO SUCH AS HAVE CHOSEN THEM TO SPEND THEIR LABOURS AND STUDIES IN THEM, THEY SEEM GREAT MATTERS. ("Let those which are skilful in them, judge (after that) whether I bring them in only for appearance" or to _little_ other purpose).'