The method of using the first table is the same as that followed in the preceding cases, resembling especially the method of Table 2 in Chapter 19 of this Book.   But the present case has this peculiarity, that the key is differently signified.  For if the first letter of any square occurs, we write nothing by its side; if the second letter in order occurs, we write a comma; if the third letter, a point.  For example, let the secret text be:   Nelcire quid anti quam natus cs, factum sit, est semper esse juvenem. Cicero.  This transpose as follows: NE produces I.  But since the letter E before Transposition is found in the second order, place by the side of said letter I, a comma.  So SC produces C, but since C is a third letter, we must write by its side a point.  Thus is formed the combination to be seen in the appended scheme, at the end of  this chapter.

The use of the second and third tables depends on the fact that the key lies hidden not alone in the lateral letters, as before, but in the upper capital letters as well.  For example, if the secret given above is to be written, then the note must be added not only to the second letter of the resolved secret text, but also to the first letter, or to the first on the basis of the combination of two letters, to the second on the basis of the lateral letters.  This addition of signs is performed differently in the processes of the second and third tables.  In the second table, on the basis of the first letter of the secret text, nothing is added to the Transpositive letter when found, -- if, that is, the said first letter falls on the first horizontal letter of any square.  On the basis of the second secret letter, the process is subject to the following principle of variations:  if the said second letter is the first in the order of lateral letters, no sign is added;  if it is the second, then a comma is added;  if it is the third, a semicolon is added.  If the secret letter falls on the second horizontal letter, then to the second letter, if it is the first in the order of lateral letters, is attached a colon;  if it is in the second, a point;  if it is the third, a mark of  interrogation.  For example, NE produces L, which, having at the top the first horizontal letter in the fifth square, receives nothing in addition; but since directly across at the side it has E, which is the second in the order of lateral letters, it should, by the principle given above, add to itself a comma.  Continue thus with the other letters, and you will obtain that combination which appears in the scheme immediately following.

In the third table, besides the contraction of the alphabet, there is this further peculiarity, that there are always three horizontal letters written in each square.  The method of using the table is easily learned from the following rules, themselves partly reduced to tabular form.  If any secret letter falls on a first letter, both on a first horizontal letter and on a first lateral letter, nothing is added to the Transpositive letter when found: