PARASITES. 



55 



must be ascertained from the symptoms. If ihe sheep turns 

 to one side, open a little in front of the corresponding ear and 

 about half an inch from the median line of the skull. If the 

 head is elevated and the walk straight forward without much 

 teiror or disorderly movement, open at the same level but in 

 the median line. If there is awkward, hesitating movement, 

 much terror, flurry, and stumbling, open in the median line 

 further back. A flap of skin is to be dissected up from the 

 bone, large enough to admit a trephine one-eighth inch in 

 diameter (in an emergency a gimlet will do), with which the 

 bone is to be perforated. After this the cannula and trocar is 

 used as above advised. 



If more than one cyst should be present the operation may 

 require repetition, and with care recoveries often ensue. 



ECHINOCOCCUS DISEASE. 



The Taenia Echinococcus, a tape worm of the dog, not exceed- 



Fig. 2.— Taenia Echinococcus magnified. (Cobbold.) 



Fig, 3. — Portion of cyst and heads of Echinococcus. 



ing one inch in length, lives in its cystic form as Echinococcus 

 {E. Hominis, E. Vcterinornm), in the most varied internal 

 organs of men and animals. As the cystic form of this parasite 



