408 ACCIDENTAL COLOURS. 



of the sun, and does not adjust itself 

 immediately to the feebler light of terres- 

 trial objects; but, independent of this, 

 the "ACCIDENTAL COLOUR" of the sun 

 being dark violet, would tend to throw a 

 shadow upon all things. fSee p. 366. J 



Q. Why is BLACK glass for spectacles the 

 BEST for wear ? 



A. Because white is the accidental 

 colour of black ; and if we wear black 

 glasses, every thing will appear in white 

 light, when we take them off. 



Q. Why does every thing seem shadowed with 

 a BLACK MIST, when we take off our common 



SPECTACLES ? 



A. Because the glasses are white, 

 and black being its " accidental colour," 

 every thing appears in a Hack shade, 

 when we lay our glasses down. 



The accidental colour of red is bluish green. 



of orange blue. 



of violet yellow. 



of black white. 



And the converse of this is true : 



The accidental colour of bluish green is red. 



of blue orange. 



of yellow violet. 



of white black. 



