DISEASES OF THE DIGESTIVE ORGANS. 



101 



whisking and rubbing of the tail, and occasionally some dry, white 

 matter may be seen adhering around the anus. Worms may exist 

 for a length of time without presenting any outward appearance which 

 might lead to their detection. 



In some cases they injuriously affect the health of the horse, whilst 

 in others they seem to do no harm. 



As a general rule, when a horse has worms his system is out of order 

 — possibly not on account of the worms, but perhaps the worms find a 



Fig. 68. 



Oxyuris vermicularis. a. Natural size; b, 

 Head, magnified ; c, Tail, magnified j d, 

 Head, more magnified. 



Fig. 69. 



Male and female Trichoeephalus dispar, 

 magnified. 



suitable tenement in his intestines because they are out of order^ just as 

 the mange insect will lodge in an unhealthy in preference to a healthy 

 skin. 



Treatment. — A temporary clearance may be effected by the follow- 

 ing: 



Spirits of turpentine § ij. 



Linseed oil 1 pint. 



or as a ball: 



