180 



BOYS AND GIRLS IN BIOLOGY. 



the closer you see them, and the wrong side is often as 

 beautiful as the right. Just that dust of meal the but- 

 terfly leaves on your fingers contains colors as rich as 

 the rainbow, and jewels as brilliant as the pearl, topaz, 

 and sapphire, all shining together. If you examine them 

 separately, you will find many different shapes ; most 

 of them resemble leaves, and the little stem that fastens 

 them to the wing looks like the foot-stalk, or petiole, 

 of the leaf (Figs. 146-150). One is formed just like 

 a battledore. Each tiny scale has three layers ; those 



Fig. 151. 



Butterfly's Wing, showing how the Scales are fastened, and the Scaes of 



the Fastenings. 



outside are highly colored and decorated, while the 

 inside one is plain and forms a foundation for the or- 

 namental work. The wing itself where the scales are 



