No traces of this initial column appear for the series in the middle division, and several of the numerals are also erased. Two obscurities must be cleared up before trying to fill out the series. On page 16 right is a partly erased black numeral, which from the traces may be either 10 or 11. Taking it as 10, we have 13 plus 10 equals an erased red 10; plus 5 (on page 17) equals the red 2 below the 5. This verifies so far. But we next find--plus 5 equals 8, which is of course incorrect. An inspection of the MS. and the photographs reveals a reddish spot (or perhaps even _three_ such spots) in the extreme upper right corner of the picture space, 17-a, and also a dark spot _under_ the black 5 in 17-b. It is possible that the separated red dots (one doubtful) are to be read together as 3; or that the red dots under the 5 are to be disregarded in the count (just as is the red 8 on the next page, 18-a), and the red number for 17-a found in the upper right, above the seated figure. If the red number in 17-a is 3, the two numbers in 16-c must be 11. Or it may be assumed that the spot under the 5 in 17-b belongs to it, making 6 instead of 5, which figures out. The final result is the same, as we have either 10 and 6, or 11 and 5, in these two places, and either reaches properly the clear red 8 in 17-b. In 18-a we find black 26, with a small red 8 below, and a large red 13 in the usual place at the side. The red 8 will have to be disregarded, as not part of the series, which requires 13, and nothing else. We may now possibly set down the series as follows, using small figures above the the[TN-2] line for the black counters, and putting in parentheses all numbers restored: (6)^{3}9^{(6)}(2)^{5}7^{6}13^{11}(11)^{5}3^{5}8^{5}(13)^{26}13^{10}10, or else (6)^{3}9^{(6)}(2)^{5}7^{6}13^{10}(10)^{5}2^{6}8^{5}(13)^{26}13^{10}10 This leaves us the black number at the beginning, in 15-a, and both numbers at the end, 18-c, still not filled in. Adding together all the counters we get 82, plus at least the two missing black numbers, one at each end. If the total were 104, we might expect it to have been comprised within the four subsections 15-a to 18-a. But 104 is not a tonalamatl fraction. 130 days, although a tonalamatl half, is an unknown division, and would hardly get into the space. If we begin the series in the upper division of the page (as occurs in Dres.) and come around to the middle division, the probabilities would require that it displayed a full series of 260 days, and again also that it began _to the left_ of page 15. The probabilities of this series as it is, therefore, indicate at least a page 14 to the left, arranged like the other four, and forming one chapter with them.