ON THE EYE. 37 



period {vide pi. 7, /. D). The appearance of 

 the eye in an inflamed state, whether from ex- 

 ternal injury or from a bad habit of body, is 

 nearly the same. The surface becomes clou- 

 dy and opaque, and frequently a yellowish 

 red, and sometimes green fluid is seen floating 

 in the anterior chamber of the eye. The opa- 

 city of the outward surface is produced by the 

 coagulable lymph being forced between the la- 

 minae of the transparent cornea, but is generally 

 mistaken for a film covering the outward part 

 of the eye; hence the pernicious custom of 

 blowing powdered glass, and other irritating 

 applications into the eye, is resorted to with a 

 view of eroding it. 



The blood vessels of the tunica conjunctivaj 

 or white of the eye, are turgid during inflam- 

 mation. In this state the light is painful, and, 

 in order to prevent its entrance, the eye-lids are 

 generally closed . When the eye-lids are opened 

 D 3 by 



