EXPERIMENTS ON THE PERCEPTION OF COLOUR. 



269 



TABLE I. The observations arranged in groups. 



TABLE IV. The averages of the errors of the several colours from the means in 



a circle. 



parts of 



Colours. 

 Errors. 



V. 

 83 



U. 

 99 



G. 

 80 



W. 

 61 



B. 

 1-15 



T. 

 1-09 



Average error on the whole '92. 



The equations from which the reduced results were obtained were calculated as follow : 



Equation for (W) = (II) + 2 (III) + (V)-2 (I) -4 (VI). 

 Equation for (Y) = 2 (I) + 2 (II) - 3 (III) + 2 (IV) - 3 (V). 





