VETERINARY OPHTHALMOLOGY. 



135 



part of the ophthalmoscope, does, being a mirror 

 pierced by a hole for observation. An ophthalmoscope 

 consists principally of two parts— a mirror and a lens, 

 and the mirror is the essential part, everything else 

 being accessory. 



" Find out the cause of this effect. 

 Or rather say the cause of this defect, 

 For this effect defective comes by cause." 



Hamlet. 



FINIS. 



