594 



DEVELOPMENT OF THE ECHIXOCOCCUS-BLADDER. 



dog as the presumptive host of Tcenia echinococcus, yet we may all 

 the more readily leave the matter without further discussion since the 

 supposition in question is entirely hypothetical, and supported by 

 no facts whatsoever. We may confidently leave it to the future to 

 discover whether the T. echinococcus is found in the intestine of 

 Australian shepherds or of the inhabitants of any district where the 

 JZckinococcus-disesise is epidemic ; till then we must be contented with 

 the related bladder-worm stage. 



I must take this opportunity of noting that, according to Leisering, 1 

 the Tcenia echinococcus, if occurring abundantly in the intestine of the 

 dog, sometimes occasions states which are in their external symptoms 

 so like hydrophobia that they could hardly be distinguished from it. 



Development of the Echinococcus-Bladder. 



Leuckart, Gottingen Nachrichten, Jan. 1862, or, in more detail, first German edition 

 of this work, p. 342. 



Naunyn, " Entwickelung des Echinococcus," MuUcr't Archiv f. Anat. u. Physiol., p. 

 612, 1862. 



The experiments made by Haubner and myself, in which we fed 

 lambs, sheep, and goats with ripe proglottides, remained without 

 result. The dissection was made sometimes soon, sometimes at a 

 longer time, after the feeding, but an Echinococcus was never found, 

 although we observed that the liver, and in many cases the lungs also, 

 were penetrated by small white points like miliary tubercles, which 

 could only be caused by the entrance of the young brood. 



All the greater was my joy when I afterwards discovered that 

 the pig may be very readily infected by the eggs of Tccn'ia echinococcus. 



The four experiments which I 

 made upon this animal were all 

 successful, and have enabled 

 me to establish a series of facts 

 which will always serve as the 

 starting-point for further ex- 

 periments. That I have not 

 traced to its close the life- 

 history of the Echinococcus, is 

 due to the fact that I have 

 of late lacked the necessary 

 materials. 



In the first of my experi- 

 ments the young pig was examined four weeks after the feeding. 



FIG. 320. Young Echinococcus, four weeks 

 old, escaping from the capsule. ( x 50.) 



1 Bericht iiber das Veterindnvesen Sachsens, Jahrg. x., p. 87, 1867. 



