EXAMINATION 15 



on the anterior part of the crystalhne lens ; 

 whilst the third image, which is inverted, is 

 produced by a reflection from the posterior part 

 of the lens. 



"When the candle is moved, the two erect 

 imao-es move in the same direction as the 

 candle, but the inverted one moves in the 

 opposite direction. 



When cataract is present, the inverted image 

 is rendered very indistinct, or is frequently 

 absent altogether, and this applies to the second 

 erect image also. This test is a very sure one, 

 and may be perfectly well relied upon. A 

 horse suffering from cataract should never be 

 purchased if required for fast work, and espe- 

 cially for hunting, inasmuch as defective vision 

 in an animal wanted for these purposes is sure 

 to lead to an accident. But for work on a farm 

 or slow draught work it is immaterial. Catar- 

 acts are undoubtedly hereditary, and the presence 

 of one in the eye of a stallion or brood mare 

 renders the animal useless as a sound stock- 

 getter. 



Fore-leg. — After making a careful examination 



