EXPERIMENTS 271 



half a minute. Then look steadily at a white surface and note 

 any color changes which appear upon it. 1 



b) Repeat using other colors. 



[Ifr) Anatomy of eye: a) Demonstrate muscles of sheepV 

 eye, coats, optic nerve, cornea, iris and pupil. 



b) Cut eye open with scalpel from front to back. Dem- 

 onstrate aqueous humor, anterior chamber, iris, lens, ciliary 

 process, vitreous humor, retina and blind spot (optic nerve).] 



1 The color which appears is complementary to the original color. 

 White is made up of the three fundamental colors red, green and 

 violet. When the retina is fatigued for any one of these, the other 

 two preponderate and tinge the white. 



