Thus, Trithemius.  Since, however, even this Mode may be easily traced by a shrewd observer, it may be obscured by writing the first line of the epistle according to the method of the first scheme, the second line according to that of the second scheme, and the third line according to that of the third scheme, and so on.  Or even the following method may be employed:  the first work, or, if you prefer, the fist letter may be taken from the first system, the second word or letter from the second system, the third word or letter from the third system, and so on by this successive process.  If an example is desired, the following may answer: Let the secret text be Virtus est, ubi occasio admonet, dispicere.  This is taken from the first three Modes by the successive method in the following way: Glitno Csu Gbr Fccbsrf Hdmmndt Disaicqrk.  From the six Modes, -- that is, the three direct, and the three following these, -- the aforesaid secret is to be read thus: Glithe Csu Bbr Fccgsrf Hdmknct Ddsudcqrm.  This Mode may be still further varied by taking the first letter from the second system, the second letter from the first system, the third letter from the third system, and so on.  You may proceed in the same way with the musical notes, Ut, Re, Mi, Fa, Sol.  For here too are found the  five vowels, which, together with their respective consonants, are transposed mutually according to the aforementioned method.  The other letters, as b,c,d,g,h,k,l,n.p,q,x,y,z, are, should these occur, placed by the side of the first, without Transposition.  For example, if we have the word Omnipotens to write, the following combination is produced:  Sinmpsurno.