At this point another change occurs: the former difference is added to the last figures and the sum is doubled. Twenty year periods. Years. Months. Days. 15 3 0 5 1 0 -- -- -- -- 1 0 4 0 2 -- -- -- -- 2 0 8 0 Third column lower division, Plate 71. 1 0 4 0 -- -- -- -- 3 0 12 0 Second column, lower division, Plate 71. 1 0 4 0 -- -- -- -- 4 0 16 0 First column, lower division, Plate 71. 1 0 4 0 -- -- -- -- 5 1 2 0 Sixth column, lower division, Plate 70. 1 0 4 0 -- -- -- -- 6 1 6 0 Fifth column, lower division, Plate 70. This series does not end at this point, but is continued in the lines immediately above, which are as follows: TABLE XXV.--_Table showing relations between Plates 70 and 71._ ________________________________________________________ Plate 70. | Plate 71. ----------------+--------------------------------------- 5th 6th | 1st 2d 3d 4th 5th column. column. |column. column. column. column. column. 1 | 0 8(?) | 15 13 10 9 7 | XII 12 1 | 3 2 2 2 1 | II 3 10 | 6 16 4 0 10 | XII 0 0 | 0 0 (?) 0 0 IV Eb. IV Eb. | IV Eb. IV Eb. IV Eb. IV Eb. IV Eb. -------------------------------------------------------- Adding the difference, 1, 0, 4, 0, to the final result of the preceding addition we obtain the figures of the right hand column (fifth column, Plate 71) of this series: 6 1 6 0 1 0 4 0 -- -- -- -- 7 1 10 0 To obtain the figures of the fourth column this difference must be doubled, thus 7 1 10 0 2 0 8 0 -- -- -- -- 9 2 0 0 To obtain the black numbers of the next (third) column, the lower cipher symbol of which is wanting, we add the former difference: 9 2 0 0 1 0 4 0 -- -- -- -- 10 2 4 0