PARASITES 619 



may occasion considerable irritation witliia the larger bowel, but we can 

 easily expel them with purgatives. The worm in the eye (Filaria jxtpillosa) 

 is confined to tropical countries, and moreover the inconvenience it creates 

 is readily cured by its removal. Lastly it is almost superfluous to mention the 

 occurrence of the gid hydatid (Ccenurus cerehrcdis) and other forms of cestode 

 larvae {Cystlcercus fistularis), since the assistance of the veterinary practitioner 

 is rarely demanded for the treatment of the disorders they produce. 



" It assuredly does so happen that bad forms of parasitism in the horse 

 are comparatively rare ; and this I take to be due, not so much to the 

 alleged innocuousness of the individual parasites themselves, as to the cir- 

 cumstance that horses are, as a rule, much more closely looked after, in a 

 sanitary sense, than most animals. The scrupulous cleanliness observed in 

 all large stables is eminently destructive to the welfare of parasites, and 

 the large proportion of dry and artificially prepared fodder consumed by 



Fig. 105(1.— Group of Bots attached to the Stomach, 



horses leaves little opportunity for the transference of the ova of cestodes 

 and nematodes, which require a cei'tain amount of moisture for their preserv- 

 ation in the free condition. Moreover, the drinking water supplied to 

 horses is, generally speaking, tolerably pure." 



This summary on the part of the best helminthologist of the century 

 makes it unnecessary to trouble the reader with the life history and 

 detailed anatomy of worms with which the late professor was wont to regale 

 his classes. 



Remedies. — For the intestinal worms of the round varieties, turpentine, 

 santonine, emetic tartar, iron, aloes, and thymol. For tapeworms — Areca 

 nut, iron and oil of male fern, infusion of kousso, aperients generally. For 

 doses see Anthelmintics. 



BOTS 



The larv^ of the oestrus egui, a species of gadfly, are often found in 

 large numbers, attached by a pair of hooks, with which they are provided, 

 to the cardiac extremity of the stomach ; they are very rarely met with in 



