74 FEEDING WITH ECHINOCOCCUS VETERINOBUM. 



the contents of a fruitful Echino coccus -vesicle were employed. 

 That is to say, free scolices developed by gemmation were taken 

 out of the Echinococcus-vesicle, mixed with luke-warm milk, 

 and poured down the dogs' throats; the latter, after having 

 in this manner been made to swallow a considerable quantity 

 of the young of the Echinococcus, had some pure luke-warm milk 

 given to them, which they licked up with avidity, so that 

 these continued acts of deglutition made sure of the small Echi- 

 nococcus-larvtt or scolices being washed into the dogs' stomachs. 



The examination of these dogs after death proved, that the 

 scolices of the Echinococcus veterinorum, when conveyed into 

 the dog's digestive canal, do not perish, but, under certain 

 favorable circumstances, develop into proper sexually matured 

 tape- worms, possessing only a couple of joints. After the 

 feeding, they passed without obstruction from the stomach into 

 the small intestine of the dogs, where, in proportion to the 

 number of scolices administered, they were found in immense 

 numbers fully extruded from their receptacle, whilst, when in 

 the interior of the parent vesicle, they are almost always to be 

 found retracted within it. After remaining from fifteen to 

 twenty days in the dogs' intestinal canal, these scolices, which 

 when administered were without joints, exhibited a two-jointed 

 body. After twenty-two days, the body was divided into three 

 joints, and from this time forward these little tape- worms ceased 

 to increase in length, or to become further divided, whilst 

 the sexual organs began to appear in the two posterior of the 

 three articulations. The development of the eggs in the sexual 

 organs of these little worms was to be seen twenty-six days 

 after the feeding, and the embryo appeared on the twenty- seventh 

 day. 



With the maturity of their sexual organs, and the division 

 of their body into three joints (and hence with the pro- 

 duction of only two Proglottides) , I concluded these worms 

 had attained their perfect state) from the circumstance that 

 amongst the three-jointed little tape- worms in the dogs' small 

 intestine, I discovered several individuals which had already, 

 twenty-seven days after the feeding, thrown off the circlet of 

 hooks. The loss of this apparatus amongst Taeniae furnished 

 with it, is a proof of mature age. When I endeavoured to 

 determine the systematic position of the tape- worms which 

 had been developed from the scolices of the Echinococcus vete- 



