876 TRANSLATIONS AND SELECTED ARTICLES. 



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 Taeniae 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 Caenurus. 

 Eleven days afterwards, on examining the body, we found 36 Taeniae 

 in the intestine. In another, 60 scolices were also given, and at the 

 end of eleven days 51 Taeniae were discovered. This shows nothing. 

 But in a third experiment, in which a dog was also made to take 60 

 Caenurus heads, when it was killed, sixteen days afterwards, we found 

 78 Taeniae 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 Caenurus heads to a sucking 

 puppy, which was carefully secluded in our laboratory. When killed, 

 twenty days afterwards, we found in the intestine 237 Tapeworms, 

 varying in size from 4 to 60 centimetres — a result doubly perplexing, 

 because we found 137 Taenias more than we had sown, and because, 

 having admiiiistered scolices from the same vesicle, and in the same 

 stage of development, we found, at the end of no more than twenty 

 days, the inexplicable difference of length of from 4 to 60 centi- 

 metres. 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 Caenwus having 

 about 100 scolices on its surface. Killed at the end of forty-five days, 

 it did not afford a single Taenia. Another full-grown dog devoured 

 a Caetiurus upon which were counted about 100 lively scolices. When 

 killed, forty-five days afterwards, it afforded also only a negative 

 i-esult. 



" But if we admit that some serious doubts still require to be dissi- 

 pated with respect to the transmigration of the Caenurus cerebri of the 

 sheep to the intestine of the dog, we are infinitely more decided with 

 respect to the peregrination of the ova of the Taeniae of the carni- 

 vora to the brain of the ruminant. 



" Our experiments were made upon two lambs, to each of which we 



