[1] It was afterwards found that these colour changes through variations of intensities were due to a natural law to be described under the heading of “Specific colour.” (See page 32.)
[2] For description of the light and colour units, refer to chap. III, page 9.
[3] It was found that the superimposition of two glasses did not visually disturb equivalence, therefore only two glasses were used for each observation in constructing the scales.
[4] This method of illustration was suggested by Dr. Herbert Munro.
[5] Reprinted from the Journal of the Society of Dyers and Colourists, March, 1913. No. 3, vol. xxix.
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