Report of the Committee on Colour-Vision. 393 



Fig. II. 



request him to turn the button until he brings several skeins of 

 what appear to him to be the same colour on the disc opposite 

 to the one he has to match. When the examination with this 

 colour is completed, the pink skein is proceeded with in the 

 same manner, and this is followed by the other test colours, if 

 considered necessary, following- it, if desired, with from one to 

 twenty confusion colours. The colours on the disc which are 

 chosen can be registered by numbers for future reference, or 

 for comparison with the results of a second examination, where, 

 in case of disputes, it is called for. 



Appendix V. 



Test with the Spectroscope. 



The test with the spectroscope requires an apparatus somewhat 

 complicated in construction, and therefore expensive, but it should 

 be applied when an appeal from the verdict of the examiner is made. 



. 2 d 2 



