Abstract
In Fig. 2 of the above paper, which was published in issue No. 7 of the Transactions this year, certain figures were omitted from the diagram. The diagram showed curves of equal contrast sensitivity. These curves, working from the centre of the diagram outwards, should have been marked as follows:-1. O, .95, .W,.8 6, .8 1, .76, .71, .67, .62, S7.
It would be appreciated if readers would kindly amend the diagram which appears on p. 174 of issue No. 7. 1951. accordingly.
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