145 



After division of the nerves, the part below the seat of section loses sensory 

 power, and, no pain bein^ felt, the animal often ceases to manifest lameness. 



It is scarcely ever advisable to perform neurotomy on a young horse. 

 Some time ago, we performed the operation on a four-year-old colt, on which 

 all other methods had been tried. The animal has since been perfectly 

 sound, having made a good recovery. Our readers must bear in mind that 

 the treatment of navicular disease is at best mainly unsatisfactory. It is 

 always well to dispose of animals so affected, when an opportunity offers 

 itself. 



SANDCRACK. 



BY a sandcr? c"u we understand a longitudinal fissure of greater or less 

 extent in the horiy fibres of any part of the wall of the hoof, commencing 

 close to the coronet, and mostly found at the inner quarters of the fore feet and 

 at the toes of iht. iiind feet. More rarely these fissures are met with in the 

 outer quarters. At first the fissure Ts small, but it gradually extends 

 downwards and inwards. Wherever situated, sandcrack constitutes 

 unsoundness. 



In the healuiy horn, the fibres are held together by an agglutinating 

 cellular subsrance, and therefore they do not become separated. When, 

 however, the secreting membrane is injured by concussion or other cause,. 

 L 



