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<p>In connection with the proposed systematisation of heterochromatic measurements the work described was planned to show the difference to be expected between individuals and to include readings by a large number of observers so as to establish average values for various measurements involving colour differences. The paper is divided into sections dealing with: Measurements on the Ives-Kingsbury solutions for selection of observers; measurements on blue glasses; other measurements by selected observers. The conclusion is reached that the system proposed by Ives and Kingsbury appears to be reliable for colour differences of the type dealt with in the tests. The average eye established is represen
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<br>Subjects: measurements and use of instruments; photometry</div>
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