372 PENTASTOMA MNIOIDES OF THE SHEEP. 



When a dog or wolf eats the entrails of animals in whose 

 glands the parasites exist, the embryo may adhere to the lips 

 and nose, and then pass into the nasal cavities. Fiirstenberg 

 says that the linguatulse pass up the nose rapidly, and fix 

 themselves by the hooks so as not to be expelled in the act 

 of sneezing. These worms, which so suddenly change their 

 habitat, increase in size, and their generative organs are 

 developed in less than two months. They must remain a 

 year in the nose of the dog, in order to attain complete 

 development. 



There can scarcely be a doubt, says Fiirstenberg, that the 

 linguatulse found in mesenteric glands of sheep, belong to the 

 same species as those discovered in cysts in the lungs of rabbits, 

 and whose complete development in the dog Leuckart has 

 witnessed. 



Fiirstenberg has therefore confirmed Colin's observations, 

 and added some new facts as to the escape of the linguatulse 

 from the mesenteric glands. 



EPIZOOTIC AND ENZOOTIO DISEASES OF THE HORSE. 



PEEIODIC OPHTHALMIA. 



This is an affection of the eyes peculiar to the equine race, 

 and which is often incurable and eminently destructive to 

 the organs affected. It is a constitutional disease, localizing 

 itself in the eyes, and generally leading to blindness. To 

 this malady the names of periodic or specific ophthalmia 

 are given, on account of the certainty of its recurrence even 

 after an apparent cure; and that of moon blindness, from 

 its recurring monthly, or, as was supposed, with special 

 changes of the moon. It is sometimes sporadic, but at others 

 enzootic, and affects a large proportion of the animals in a 



