1891.] 



Colour of Cases of Tobacco Scotoma, c. 



,501 



neutralised by the yellow, although the yellow to him was matched 

 with white. 



The thin line curve is the normal curve. 



Case IV. The next case is that of G., suffering from very well 

 marked tobacco scotoma, occupying a considerable area. His curve 

 of luminosity of the spectrum is shown in fig. 4. The following 

 ' able refers to it : 



