OF THE HUMAN BODY. i7 



If this is true, their orifices must be double, for 

 we have remarked that tlie eggs of the taenia may 

 be pressed from them,(y8) as all naturalists a- 

 gree.(99) 



§ XVIII. That these worms originate directly 

 from eggs, deposited by the same species, can no 

 longer be doubted. (100) PaUas[iOi) introduced 

 into the belly of a small dog some ova of a taenia 

 canina ; a month after he laid open the belly of the 

 animal, and in his viscera found several small tae- 

 niae, having very short rings, which were not 

 above an inch in length. 



We are indebted to Werner for the discovery 

 of the parts of generation of this taenia. 



He has demonstrated that the organs consti- 

 tuting the two sexes exist in each riug,(10S) and 

 he has thus verified the doubt of some naturalists 

 in relation to the hermaphrodite species of this 

 worm. (103) 



According to his observations, two canals open 

 into the marginal papillae of each ring ; the supe- 

 rior terminates in a round tubercle, which seems 

 to be the male ; the inferior is tortuous and filled 

 with eggs, and whose lower extremity, enlarged in 

 form of a cul-de-sac, seems to form the female. 

 There is nothing therefore wonderful if the eggs of 

 the taenia are fecundated at the instant of their be- 

 ing deposited.(lOl) 



