88 COLOUR-SIGHT AND COLOUR-BLINDNESS 



any skeins among the lot presented to him which in his opinion 

 resemble the test skein. 



The lot presented are in three (3) groups. Group 1 

 consists of twenty (20) skeins ; ten (10) green in varying shades 

 and intensities, and tan (10) so-called confusion colours, which, 

 owing to hue or colour, luyninositij or brightness and purity or 

 admixture of another colour or white or black (in this case 

 undoubted impurity) may be confounded or confused with the 

 green. The confusion colours are greys, fawns and browns. 



Group 2 has ten (10) skeins ; five (5) pinks, varying from 

 rich red pink to yellow pink and five (5) confusion colours 

 chiefly blues and grey-blues and violet. 



Group 3 is also ma^e up of ten (10) skeins ; five (5) reds 

 of various kinds and five (5) confusion colours, reddish and 

 greenish browns and a yellow. 



An analysis of the table shows that all the examinees — 

 twenty (20) — were green-blind, and that although eleven (11) of 

 them selected skein 1, or a green identical with the test 

 skein, all of these and others also selected browns. Sixteen 

 (16) examinees picked out skein 8, a light yellow brown. 

 Fifteen (15) selected skein 10, also a yellow brown ; and 

 thirteen (13) skein 20, a grey brown ; besides six (6) selections 

 were made from group 2 or the pinks, and twenty-five (25) 

 from group 3 or the reds. 



In the pink group, although sixteen (16) examinees selected 

 27 or the test colour, all twenty (20) were colour defective in 

 this group, and thirty (30) selections were made from among 

 the greens in the green group. 



In the red group, nineteen (19) examinees chose skein 31, 

 or the test, and six (6) examinees 4, 6, 7, 8, 12, and 16, had 

 normal vision for red, but the other fourteen (14) were red- 

 blind, and made sixteen (16) selections from among the green 

 group. 



Some examinees selected the same skein as representing 

 two groups — green and red. 



Examinee 9, selected skein 5 — a medium olive green. 

 ,, 9, ,, ,, 12 — a medium coffee brown. 



,, 9, ,, ,, 32 — a reddish brown. 



,, 11, ,, ,, 10— a light yellow brown, 



,, 13, „ ,, 8 — a light yellow brown. 



,, 17, ,, ,, 33 — a bright red. 



,, 18, ,, ,, 34 — a greenish brown. 



