LECTURE VI. 261 



the present occasion, to mention that both 

 these zealous and industrious enquirers 

 into the structure of animals, seem to ac- 

 knowledge that there are some beings, in 

 which they have not been able to discover 

 any regular nervous system ; yet upon dis- 

 secting them, they meet with fibres which 

 they believe to be nerves. Mr. Hunter 

 has shown tliese kind of threads m the 

 sipunculus nudus. 



In animals of the worm kind, which are 

 formed of a series of rings, the nervous 

 system is also composed of an equal series 

 of connected ganglia, each ganglion sup- 

 plying that ring of the animal to which it 

 corresponds, so that each ring may be 

 considered as possessing a perfect nervous 

 system. The connection between the gan- 

 glia may also be supposed to produce ef- 

 fects which I have endeavoured to express 

 in my first lectures by the words " concur- 

 rence of impressions and actions." When 

 animals, whose nervous system is thus con- 

 structed, have such sensations as we pos- 

 sess, and recognize in the higher classes 



s 3 



