Lesson xxvi.] RAINBOW. . IJL 



thick dew. All these are of the same nature, an<J 

 are produced by the same causes as the common 

 Rainbow *. 



When we consider what a wonderful scenery of 

 nature is here displayed} and yet recollect, that 

 though these variegated beauties are the common 

 objects of vision, how few there are that under- 

 stand the reason of them, and how much fewer are 

 any way anxious about them : surely those who 

 think the doctrine of colours, 8cc. highly worthy of 

 contemplation, and who are aware that the know- 

 ledge of their causes is truly adorning to a reason- 

 able mind, ought to be thankful that their natural 

 genius enables them to understand such studies ! 



* I cannot forbear adding a note in thu place, to state a 

 fact which is not universally known : a piece of iron when 

 heated, assumes all the colours of the JJainfcetr, before it becomes red 

 hot. This extraordinary circumstance, I believe, has not yet 

 been satisfactorily account? d for. 



i 2 LESSON 



