STAGGERS. 563 



delicate an operation to be attempted by unskilful hands, 

 and should therefore be entrusted to no one but a regular 

 veterinarian. The animal must be properly secured, and 

 placed in such a position that the part to be operated on 

 should lie convenient to the hand. An incision of an inch 

 and a half in length is made through the skin, which is 

 crossed by another at right-angles to it. The soft portion of 

 the skull is now divided in the same manner as the skin. 

 The cyst will then be visible ; the skull is then turned back, 

 and the cyst taken hold of by a pair of forceps, and moved 

 gently backwards and forwards until it is loosened from the 

 brain. Should any difficulty present itself, the operation 

 may be facilitated by the assistance of a crow-quill, or a 

 very thin slip of whalebone. The sheep must then be pre- 

 vented from breathing througli the nose, and by stopping the 

 breath and pulling the cyst alternately, it will be easily ex- 

 tracted. When this has been effected, the parts of the skull 

 must be brought together, and crossed by slips of adhesive 

 plaster. Remove these in two days, and wash the part if 

 any matter appears, and dress it in the same manner. Two 

 or three dressings generally effect a cure. 



Mr. Rhind, Surgeon, Edinburgh, describes, in the first 

 volume of the " Edinburgh Journal of Natural and Geo- 

 graphical Science," a species of worm, which was found in 

 the frontal sinus of a sheep ; but is unable to account for 

 the animal being found in such a cavity. It belongs to that 

 genus of worms called, Pentastoma, and may be specifically 

 termed ovis. We have given a representation of this worm 

 on plate xiii. : fig. 1, the worm the size of nature ; fig. 2^ 

 the head magnified ; fig. 3, the point of the tail ; fig. 4, a 

 cross-section of the body, showing the intestines. 



