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 through 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. 
the head magnified; fig. 3, the point of the tail; fig. 4. a 
cross-section of the body, showing the intestines. 
