78 ' Miscellaneous. 



producing Tapeworms in the intestines of the Dog, by administering 

 Ccenuri. The authors have had as much success as this experiment- 

 aHst ; indeed, their success has been too great, for they sometimes 

 obtained more than they had sown. 



After briefly describing the supposed relation between the Ccenurua 

 cerebralis of the Sheep and the Tcenia serrata of the Dog, and the 

 cycle of development by which this is considered to be set up, the 

 authors proceed to discuss the difficulties in the way of these 

 views. 



Goenurus cerebralis, according to Siebold, Van Beneden, and others, 

 is the larva of Tcenia serrata. On the contrary, this TcBnia serrata 

 is produced by Cysticercus pisiformisy according to Kiichenmeister, 

 Van Beneden, Baillet, and Siebold himself, or by Cysticercus cellu- 

 losce and C, tenuicollis, according to other statements of Siebold. 

 This produces a great embarrassment. 



Referring to the general view that the TaenicB found in the intes- 

 tines of the Carnivora are due to Cystic worms inhabiting their prey, 

 the authors inquire how the Sheep, which never devours animal 

 food, sometimes has its intestines so filled with Tcenice as to be abso- 

 lutely obstructed. This was the case in an epidemic occurring in 

 1852 amongst the sheep in the environs of Rouen. 



Amongst the causes tending to produce uncertainty in the results 

 of experiments are the natural frequency of the animals which are 

 said to be communicated, and the practice of some experimentalists 

 of administering worms at several times : the unsuccessful experi- 

 ments also should be noted ; but of these frequently no account has 

 been taken. 



With the view of rendering their experiments exact, the authors 

 counted the number of heads or Scoleces administered each time, 

 and always ascertained that they were completely developed and 

 alive. 



In a dog which had swallowed Ccenuri sixteen days before, the 

 authors found Tcenia of only 2 millimetres in length, whilst others 

 measured 20 millimetres. In the same time an experimentaHst ob- 

 tained Tcenice which had reached a length of 80 millimetres. In 

 another case, when the experiment had lasted twenty-three days, 

 they found in the same dog Tcenice of 4 millimetres in length, and 

 others which had reached the length of 60 centimetres. It is im- 

 possible that the scoleces implanted on the same vesicle, and all of 

 the same age, should have produced Tcenice presenting such a diifer- 

 ence of size as this ; but the authors remark that, had they adopted 

 the plan of administering the worms several times, such an experi- 

 ment would have appeared a positive demonstration. 



They administered to a dog sixty scoleces of Ccenurus ; in eleven 

 days its intestine contained thirty-six Tcenice. In another case, sixty 

 scoleces were given, and in eleven days fifty-one Tcenice were found. 

 But in a third case, in which the dog also received sixty scoleces, 

 seventy-eight Tcenice vfexQ discovered in its intestine at the end of 

 sixteen days. Another case gave results calculated to raise still 



