Letter from George Gabriel Stokes, Lensfield Cottage, Cambridge, to Sir William Wiveleslie Abney Sends a list of documents for Abney's attention, stating that he does not think that a case has been made against the suitability of tests [for colour blindness] recommended to the Board of Trade. Much depends upon the competence of the examiner. The case mentioned by Edridge Green may be one of colour-vision scotoma and the original committee considered that this would in any event be accompanied by a general deficiency in vision. In Green's example of erroneous rejection, the examiner had not explained what was required of the examinees.Stokes suggests a checking measure with blue and yellow wools. If the Board of Trade wish the Society to draw attention to Green's paper, then the committee should meet; otherwise it is not required. 15 June 1900