-------+---------+-----------+------------+--------------- | | Mean | | Persistency | | reading, | P. and Q.’s| curve for the Scale | Mean | reduced to| readings, | centre of number.| reading.| 100 max. | 100 max. | the eye. -------+---------+-----------+------------+--------------- 55·6 | ·5 | ·6 | 2 | 2 53·6 | 5·5 | 7·0 | 3·6 | 3·6 51·6 | 13 | 16·7 | 8 | 8 49·6 | 23 | 29·7 | 22 | 22 47·6 | 40 | 50·0 | 44 | 44 45·6 | 57 | 71·2 | 69 | 69 43·6 | 70 | 87·5 | 93 | 93 41·6 | 79 | 98·7 | 100 | 99·5 39·6 | 78 | 97·5 | 99·5 | 98·5 37·6 | 74 | 92·5 | 96 | 93 35·6 | 66 | 82·5 | 89 | 84 33·6 | 55 | 68·7 | 77·5 | 71 31·6 | 44·5 | 55·2 | 61 | 53·5 29·6 | 35 | 43·7 | 45·5 | 36·5 27·6 | 24 | 30·0 | 33·5 | 24 25·6 | 17 | 21·7 | 25 | 16 23·6 | 13 | 16·7 | 18 | 10 21·6 | 10 | 12·5 | 13 | 8 19·6 | 8 | 10·0 | 9·5 | 6 13·6 | 3 | 3·7 | 4·2 | 3 9·6 | 2 | 2·5 | 2·5 | 2 -------+---------+-----------+------------+--------------- TABLE V.--LIMIT OF COLOUR VISION (see Fig. 26.).