fore-legs, like those of the bat, or the bird. Rather, it would 

 seem, they have developed out of plate-like breathing organs. 



The restful twilight hours of summer tempt not only bats 

 from their hiding-places, but a host of other winged creatures 

 which are rarely to be seen, or heard, during the glare of noon. 

 Among these is the lumbering dor-beetle, who, with lazy 

 drone steers clear of solid objects only with difficulty. Many, 

 indeed, are his failures. He and his kin are no match for 

 bats and owls, who find them juicy morsels ! On the next 

 opportunity catch one and examine him. His wings are 

 curiously interesting. There are the usual two pairs : but 

 the fore-wings have been changed to serve as covers for the 

 hind- wings. During flight they are spread outwards, and 

 indirectly, no doubt, assist flight. But the hind-wings are 

 the real propellers. And it will be noticed that when not in 

 use they can be folded up in a perfectly wonderful manner, so 

 as to lie completely underneath the fore-wings, or " eljrtra," 

 so that when the creature is crawling it appears to be wingless. 



Now compare these with the transparent wings of the 

 bee, or the gorgeously scale-covered wings of the butterfly. 

 It is well worth while. If this examination be done very 

 carefully, and with the aid of a magnifying glass, it will be 

 found that the fore and hind wings are yoked together in 

 the wing of the bee, by a dehcate mechanism of hooks. In 

 the moths, but not in the butterflies, a bristle, or sometimes 



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