FIRST LECTURE. i>J) 



this subjecfj unless we consider as a bvain, tliafc 

 protuberant mass analogous! to the substance of the 

 spinal marrow, which is seen on the head of some 

 worms. It is nevertheless certain that these ani- 

 mals are endowed with sense or feelins;, and there 

 is suiTicieut reason to believe that they have nerves, 

 especially since Professor Maiigili has proved the 

 existence of a nervous system in the Leeich, in the 

 Lumbricus terresiris, and in other worms of a na^ 

 ture like that of the human worms. 



See Brugnatelli, Gioniale fisico -medico, anno 

 1795 ; torn. u. p. 249 : *^ Be sijstemate nerveo hi- 

 riidinisj Liunbrici tevvestris, aliorumqiie vermiiim ; 

 celeberr. viro A. Scarpa, Joseph Mangili.'' 



(9) The word Taenia signifies a band ; this 

 worm is also thus named I^^^ause of its flatness, 

 length and breadth. Latterly Zeder has changed 

 the name of Taenia to that of Ahjselmenthus. 



See Zeder, JEvster J\'achtrag •zur J\f*atiirges- 

 chiclite der Eingeweidewiirmer, von Goe-ze^p. %'Zi. 

 fAlyselmenthiis, id est Taenia auctorum.J 



(10) Those naturalists, who have admitted 

 these accidental signs as characteristic marks, and 

 have founded on them their systematic division of 

 the species of the taenia, have fallen into an error. 

 See sections vi and vii. 



(11) Traite des Maladies des en fans. 



It is probalde that this worm may acquire sucli 

 a size as not to be contained in the intestines, and 

 may thus in part be expelled from the body. It 

 dies, or some, portion of it piitrefies, and is evaru- 



