2?4 OBSERVATIONS OK 



the air in a stationary position for some 

 time, and then fly off again ; but do not 

 recollect having ever seen it strike its tail 

 against the ground, or any other substance. 



MARKWICK. 



MUSCLE. FLIES. 



In the decline of the year, when the 

 mornings and evenings become chilly, 

 many species of flies (muscce) retire into 

 houses, and swarm in the windows. 



At first they are very brisk and alert ; but 

 as they grow more torpid, one cannot help 

 observing that they move with difficulty, 

 and are scarce able to lift their legs, which 

 seem as if glued to the glass ; and by de- 

 grees many do actually stick on till they 

 die in the place. 



It has been observed that divers flies, 

 besides their sharp hooked nails, have also 

 skinny palms, or flaps to their feet, whereby 

 they are enabled to stick on glass and other 

 smooth bodies, and to walk on ceilings with 



