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  Also, it must be recognized that the  first four words of the  first verse begin with these consonants, b c d f, like all the other words that follow. By this it must be understood that all the moods indicated by a word beginning with b are to be reduced to the  first mood of the  first  figure, and all the moods signified by a word beginning with c to the second mood, those beginning with d to the third and those with f to the fourth. Also, wherever an s is put in these words, it signifies that the proposition understood by the immediately preceding vowel is to be converted simply. And by p it signifies that the proposition is to be converted accidentally. Wherever m is put, it signifies that a transposition in premises is to be done, and a transposition is making a minor out of a major, and the converse. Where c is put, however, it signifies that the mood understood by that word is to be confirmed by impossibility.

  Also, it must be recognized that the  first four words of the  first verse begin with these consonants, b c d f, like all the other words that follow. By this it must be understood that all the moods indicated by a word beginning with b are to be reduced to the  first mood of the  first  figure, and all the moods signified by a word beginning with c to the second mood, those beginning with d to the third and those with f to the fourth. Also, wherever an s is put in these words, it signifies that the proposition understood by the immediately preceding vowel is to be converted simply. And by p it signifies that the proposition is to be converted accidentally. Wherever m is put, it signifies that a transposition in premises is to be done, and a transposition is making a minor out of a major, and the converse. Where c is put, however, it signifies that the mood understood by that word is to be confirmed by impossibility.

Wikipedia doesn't have a citation, but mentions Jerome who described the method -- it is known in the Cabala as 'athbash' "[a principle of commutation in which] the letters are also mutually interchanged by pairs; but every pair consist of a letter from each end of the alphabet, in regular succession." [https://books.google.com/books?id=3SstAAAAYAAJ&pg=PA503 Cyclopedia of Bibilica, Theologial, and Eccleslastical Literature 1869]... Jermone applied it to the word Sheshak (which is decoded as Babel) in Jer xxv 26. and referred to the method of learning the Greek alphabet.

Wikipedia doesn't have a citation, but mentions Jerome who described the method -- it is known in the Cabala as 'athbash' "[a principle of commutation in which] the letters are also mutually interchanged by pairs; but every pair consist of a letter from each end of the alphabet, in regular succession." [https://books.google.com/books?id=3SstAAAAYAAJ&pg=PA503 Cyclopedia of Bibilica, Theologial, and Eccleslastical Literature 1869]... Jermone applied it to the word Sheshak (which is decoded as Babel) in Jer xxv 26. and referred to the method of learning the Greek alphabet.