556 THE HUMAN BODY. 



lake in the moonlight, we get the perception of a "shiny " or 

 brilliant surface. The moonlight is reflected from the waves 

 to the eyes in a number of bright points: these are not ex- 

 actly the same for both eyes, since the lines of light-reflection 

 from the surface of the water to each are different, The 

 perception of brilliancy seems largely to depend on this 

 slight non-agreement of the light and dark points on the two 

 retinas. A rapid change of luminous points, to and fro be- 

 tween neighboring points on one retina, seems also to pro- 

 duce it. 



