82 PROPHYLACTIC MEASUEES. 



brain, about the size of a pin's head. They lay partly free on 

 the vessels in the convolutions of the brain, partly imbedded in 

 superficial canals formed of exuded matter, the substance of the 

 brain representing the bottom, ^nd the exuded matter the cover- 

 ing of the canals. The whole animal (heart, lungs, muscles, 

 &c.) was at the same time permeated by the encysted young of 

 the tape- worm. Later dissections showed fewer but larger cysts 

 in the brain. Mr. Haubner conjectures, and rightly so, that 

 the rest were abortive and died away. After fourteen days, 

 always reckoning from the first morbid symptoms, the same 

 observer discovered several dark spots in a few of the cysts, 

 which were probably the projected heads. After four weeks all 

 the cysts had separate heads with distinct suckers ; and, as it 

 appeared, with the circlet of hooks in course of development/' 



After having thus proved by facts that the immigrated young 

 of the Taenia serrata in ruminants can develope into Ccenurus 

 cerebralis^- I feel justified in advising, as the most important 

 preservative against the Coenurus, that the immigration of the 

 young of the Taenia serrata into ruminants should be prevented. 

 The utility of this advice will certainly be admitted by every one 

 who has made himself acquainted with the history of the intestinal 

 worms in the foregoing pages of this pamphlet; but beyond 

 this, persons will be also desirous of knowing how it can be 

 practically carried out. When I consider the many hidden paths 

 by which most of the intestinal worms make their way during 

 their existence, I must confess once more that it will be a most 

 difficult task for those engaged in the breeding of cattle to 

 prevent the excessively small young of the tape-worm from pass- 

 ing into their oxen and sheep. 



It may be safely assumed that the young of the tape-worm 

 pass with the food into the digestive passages of the ruminants 

 whilst they are eating and drinking. How easily the fresh as 

 well as the dry fodder of ruminants may become contaminated 

 with the ordure of dogs containing eggs of the Ttenia serrata ; 

 especially when we remember that these eggs possess great 

 tenacity of life, and are able to withstand for a considerable time 

 external injurious influences, such as cold, heat, drought, &c. 



' Through the kind communication, by letter, of Professor Leuckart, of Giessen, I 

 have just heard that he has succeeded in generating the Cysticercus fasciolaris in the 

 livers of white mice, after having given them sexually developed joints of the tape-worm 

 of the cat ( Tania crassicollis) to eat. 



