ECHINOCOCCUS ALTRICIPARIENS. 219 



tlie excrescence were only connected as if by the finest threads. 

 Particular segments of the larger excrescences, however, already 

 exhibited the lamellar structure of Echinococcus with the granular 

 contents. Together with these bud-like excrescences there were 

 also, in the above-mentioned vesicles, isolated, smaller vesicles 

 already separated by constriction ; these were spherical, biscuit- 

 shaped, and otherwise variously formed, being especially furnished 

 with pedunculiform appendages. No hooks, suckers, &c., were 

 ever found in these formations. 



I have myself been for years acquainted with the process here 

 described with reference to Echinococcus scolicipariens, although 

 only in domestic animals. It would also have long since been 

 known to surgeons, and the whole confusion as to the question of 

 alveolar colloid now set aside by Virchow could never have been 

 produced, if more attention had been paid to the comparative 

 pathology of the domestic animals. I regarded the affair as so 

 simple that I only referred to it in a few words in a previous part 

 of this work. 



Had I anticipated the necessity of giving a more exact account 

 of the processes which take place when the cystic worms, by 

 entering into every possible neighbouring vacuity in the tissues, 

 form runners and appendages, and these organisms with their 

 appendages become destroyed, or become separated by constriction, 

 I would have done so. However, I see how necessary Virchow's 

 corrections were, and for this reason I may be permitted to refer 

 to the subject here. It will be easily seen where I differ from 

 Virchow, and I may be allowed to call the attention of patho- 

 logical anatomists to the livers of pigs, sheep, and cattle in con- 

 nection with the study of this process (although without nesting 

 and the formation of daughter-vesicles), and to advise them, in con- 

 nection with the course of development or the sterility of such 

 colonies, to make experiments on the administration of the eggs 

 of all sorts of Teenies, which pass through the intermediate state 

 of cystic worms. 



With regard to the first point I must agree unconditionally 

 with Virchow. 



With regard to the second point, however, we must not pro- 

 ceed so exclusively as Virchow has done. As it was in the 

 blood of the portal vein that Leuckart found the embryos of 

 Taenia serrata, as Luschka met with the larger diverticula in 

 this vein, and these extended from the larger branches into 



