A 1 1 B X B 11 2 UU RR C 0 D 1111 4 UNLU ANSA E 1111111111111 13 MHOIDPZZMBQUC RREOIQPNRIBQB F 1111111 7 PCCJEOC NIIBMVT G 1 1 U P H 0 I 0 J 11 2 UM TT L 0 M 11 2 UI TZ N 0 O 111111111 9 HCJCHCVIG BLIBBIQYB P 0 Q 1111 4 DDLL XTXX R 0 S 11 2 HT BI T 111 3 OED DDX U 1111111 7 JDDDLUL ZTVAQZN V 11 2 CI TI X 1 0 I Y 11111 5 IHLUH XDRRT Z 0 We will now set down some of the determinations which can be made at once from these frequency tables. Clearly several mixed alphabets have been used. As was to be expected from the analysis of the recurring groups, we note that the frequency tables for alphabets 2 and 6 are of so nearly the same general form that certainly these two alphabets are one and the same. If a Spanish word has been used as a key word, this means that A is probably represented by a vowel in these two alphabets and probably equals A or O, because these two letters are such common finals in Spanish. 1st Alphabet. Probable vowels T, X; probable common consonants, B, I, N, R. We conclude this because of the frequency of occurrence of T and X and the variety of their prefixes and suffixes. On the other hand, B, I, N, and R have for prefixes and suffixes, in a majority of cases, E, F, O and S which are the probable vowels in the 2d and 6th alphabets. 2d and 6th Alphabets.--Probable vowels E, F, O, S; probable common consonants, D, J, Q, U, Y. 3d Alphabet.--Probable vowels C, I, L; probable common consonants A, Q, T, Y. 4th Alphabet.--Probable vowels, E, G, S, T; probable common consonants, C, M, N, P, U, X. 5th Alphabet.--Probable vowels, D, L, U; probable common consonants, C, H, I. Now this cipher may have been made up from five distinct alphabets with letters chosen at random but it is much more likely to have been prepared with a cipher disk or equivalent, having the regular alphabet on the fixed disk and the mixed alphabet on the movable disk. An equivalent form of apparatus (not using the mixed alphabet in question) is one like this: