52 



first administration, the calf was slaughtered. The 

 flesh was carefully examined, and, according to my 

 estimate, contained no less than 8,000 measles. 

 These measles were undoubtedly the young of the 

 unarmed tapeworm, presenting as they did the essen- 

 tial characteristics which I have already described ; 

 viz., the absence of the crown of hooks ; the broad, 

 flat head and neck ; and the absence of the prominent 

 rostellum." 



In looking over the first volume of Aitken's " Sci- 

 ence and Practice of Medicine," 1 find a resume of the 

 experiments of Professor Leuckart of Giessen (whose 

 results are the same as those of Dr. Cobbold), and 

 which I transcribe as proof additional of this point : 



" He fed two calves with the fresh eggs of the 

 T. mediocanellata, by giving them the proglottides of 

 this parasite. The first animal he experimented on 

 died from a violent attack of the measles disease ; and, 

 on dissection, the muscles were found filled with 

 measles or vesicles, containing imperfectly developed 

 scolices. On the second day, a smaller number of 

 proglottides (in all about fifty) were administered, 

 and the febrile symptoms again appeared with such 

 violence, that Leuckart thought this animal would 

 die also. Fortunately, after the lapse of a fortnight 

 from the commencement of symptoms, some abate- 

 ment of the disease took place ; and this gradually 

 continued until the animal was perfectly restored to 

 health. Eight and forty days subsequent to the earli- 

 est feeding experiments (which were continued at 

 intervals for eighteen days), Professor Leuckart extir- 



