CHAPTER VII 

 LIGHT AND COLOUR 



IT is easy to see that most of our light comes to 

 us from the sun, and that light in some way 

 brings colour. It is very difficult to say how 

 light comes, what light is, and in what way it 

 creates colour ; and even when we have found 

 answers to all these questions we still do not in 

 the least know why it comes. It is a common 

 mistake to think that if we know how a thing 

 happens, we know the reason why it happens. 

 Men of science give up their lives to try to dis- 

 cover the methods by which Nature works, and 

 we are following a little of the way after them ; 

 but even they know nothing about the First 

 Cause which creates these wonderful effects we 

 are trying to trace out. 



Light comes to us from the sun, and when 

 the evening sets in, and the part of the earth we 

 are on turns away from the sun, it begins to 

 shine on other parts of the earth, making day- 

 light for them. It is quite true that it is always 

 midday somewhere on this globe of ours, as it 

 keeps turning round and round ; and quite true 

 also that somewhere it is always midnight. The 



(SO 



