II; 20,
I; 10, XI; 15, XIII; 9, IX; 11, VII; 20, I; 10,
XI; 15, XIII; 9, IX; 11, VII; 20, I; 10, XI; 15, XIII; 9, IX; 11,
VII; 20, I; 10, XI; 15, XIII. By adding together a black numeral and
the preceding red one and casting
out thirteen (or thirteens, as the case maybe), when the sum exceeds
this number, we obtain the following red one, thus: XIII + 9 - 13 =
IX; IX + 11 - 13 = VII; VII + 20 - 13 - 13 = I; I + 10 = XI, and so
on through the entire series. Attention is also called to the fact
that the
sum of the black (Arabic) numbers 9,
11, 20, 10, 15, 9, 11, 20, 10, 15, 9, 11, 20, 10, 15, 9, 11, 20, 10,
15,
is 260, a multiple of 13. If this relation of days and numerals holds
good as a general thing throughout the codex, it is apparent that
where the break is not too extensive it will enable
the student to res
