174 POUCHET AND VERRIEK, ON 



millimetres. In another case, at the end of twenty-three 

 days, we found in one and the same dog Tmnm 4 millimetres 

 long; and others, which had reached the enormous length of 

 CO centimetres. Is it possible that the scoJices of the Ccenuri 

 implanted on the same vesicle, having the same degree of 

 development, and absolutely of the same age, after having 

 been introduced into the intestine, should exhibit, in so 

 short a time, such a prodigious difference of size, from 4 to 60 

 millinaetres ? It is inconceivable. If we had followed the 

 usual plan, and administered Ccenuri at different times, such 

 a result would apparently have afforded an evident demonstra- 

 tion. But, following the plan we did — one both more rational 

 and more rigorous — it seems calculated only to give rise to 

 doubt. 



If, however, in other experiments, we compare the number 

 of CaenuruS'SColices administered with that of the Tcpnice met 

 with, the same uncertainty under which we labour will also 

 be experienced by all serious thinkers. It is impossible, in 

 this case, to reject the evidence of ciphers. 



In one experiment, we administered to a dog 60 heads of 

 Canurus. Eleven days afterwards, on examining the body, 

 we found 36 Tcenia in the intestine. In another, 60 scolices 

 were also given, and at the end of eleven days 51 Tcenice were 

 discovered. This shows nothing. But in a third experiment, 

 in which a dog was also made to take 60 Canwus heads, 

 when it was killed, sixteen days afterwards, we found 78 Tanm 

 in the intestine — that is to say, 18 more than we had ad- 

 ministered. This is inexplicable. 



Another experiment afforded results of such a nature as to 

 raise still deeper doubts. We gave 100 Canurus-heads to a 

 sucking puppy, which Avas carefully secluded in our labora- 

 tory. When killed, twenty days afterwards, we found in the 

 intestine 237 Tapeworms, varying in size from 4 to 60 centi- 

 metres — a result doubly perplexing, because we found 137 

 TcBnias more than Ave had sown, and because, having ad- 

 ministered scolices fi"om the same vesicle, and in the same 

 stage of development, avc found, at the end of no more than 

 twenty days, the inexplicable difference of length of from 4 

 to 60 centimetres. This appears to us calculated to afford 

 ground for serious objections. 



Other experiments have afforded only absolutely negative 

 results. A full-grown Danish dog swallowed at one time a 

 Canurus haAdng about 100 scolices on its surface. Killed at 

 the end of forty-five days, it did not afford a single Tatnia. 

 Another full-grown dog devoured a Ccenurus upon which Avere 



