1 72 Appendix. 



rarely colour blind, the verdict of two ladies might be relied on. They 

 should be asked to select a sample of distinctly green wool, and to request 

 you to sort out of the rest of the heap, and to lay by the side of the 

 sample, every bit of wool that has any tinge of green in it. The majority 

 of the wools used for the test should be of delicate tints, and varieties of 

 browns, pinks, reds, violets, yellows, greys, and greens. The trial should be 

 made in good daylight, and it should be insisted upon that no clue nor 

 guidance should be given to help yon in your choice. 



