62 THE INTERNAL PARASITES OP 



other parasites can only infest young animals is entirely 

 erroneous. No doubt they occur more frequently in 

 juvenile bearers, but that old animals enjoy a perfect 

 immunity in this respect is far from being the case. In 

 his treatise on " Diseases of the Ox/' Mr. Youatt re- 

 marked that the coenurus ie occurs only in the young 

 animal ;" but the case of Hering, above quoted, is alone 

 sufficient to disprove the perfect accuracy of the state- 

 ment. I am not quite sure that it is even correct to say 

 that these parasites are less common in the cattle of 

 England than in the herds of other adjacent countries ; 

 yet I have reason to believe that this opinion is widely 

 entertained by leading members of the veterinary pro- 

 fession. My impression is that the greater readiness of 

 the Continental practitioners to come forward and publish 

 their cases of sturdy, accounts in a great measure for the 

 assumption that the disorder is more frequent in other 

 parts of Europe than with ourselves. At all events, it is 

 gratifying to learn that the trephine is employed with 

 remarkable success abroad, especially in Bavaria. Cases 

 of successful trephining for sturdy have been brought 

 under my notice ; and it only remains for me to repeat 

 to a larger professional public the suggestion I have often 

 made to my class, that all such cases should be placed 

 on record. The necessary facts can be stated in a very 

 few words. 



