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with the body by a joint of a particular 

 ftructure, with which, at fome times, 

 it makes a loud knock, particularly 

 when laid on its back. The Fly has 

 two feelers, or horns, two wings, and 

 fix legs. Under its belly is a circular 

 patch, which, in the dark, mines like 

 a candle ; and on each fide of the head, 

 near the eyes, is a prominent, globular, 

 luminous body, in fize about one third 

 larger than a muftard-feed. Each of 

 thefe bodies is like a living ftar, emit- 

 ting a bright, and not fmall light, fince 

 two or three of thefe animals, put into 

 a glafs veffel, afford light fufficient to 

 read, without difficulty, if placed clofe 

 to the book. When the Fly is dead, 

 thefe bodies ftill afford confiderable 

 light, tho' it is lefs vivid than before ; 

 and if bruifed, and rubbed over the 

 hands or face, they become luminous 

 in the dark, like a board fmeared with 

 Englijh Pbafpboruu They have a red- 



difh 



