II. THE SWALLOW. 75 



3^ou cannot be long enough to read through 

 so much as once, and of which the future 

 infinitudes of human life, however granted or 

 extended, never will be fatigued in admiration. 

 69. I take the rude outline of sail in Fig. 3, 

 and now considering it as a jib of one of our 



Fig. 4. 



own sailing vessels, slightly exaggerate the 

 loops at the edge, and draw curved lines from 

 them to the opposite point. Fig. 4 ; and I have 

 a reptilian or dragon's wing, which would, 

 with some ramification of the supporting ribs, 

 become a bat's or moth's ; that is to say, an 

 extension of membrane between the ribs (as 



