PLANARIA FELINA. 71 



been evolved from an incision in the side ; 

 and lastly, though this would have restored 

 the integrity of the animal, the separated 

 head was replaced by that law which ordains 

 the renewal of a wanting part. 



Though the sensorium of the animal 

 world be more pre-eminently distinguished 

 in the head, we cannot altogether reject its 

 universal diffusion, to a certain degree, 

 throughout the body. What was before 

 remarked, concerning the different condi- 

 tion between a separating fragment and 

 the trunk it had left provided with a head, 

 probably establishes the residence of the 

 sensorium, however low in quality, proper 

 to planariae. The truth was forcibly im- 

 pressed by the propensities of this double- 

 headed animal, coinciding with those of the 

 monster already described. Sometimes 

 when the body was in motion, the new or- 

 gan advanced as if in willing participation : 

 but on other occasions, it was reluctantly 

 dragged along. Then, instead of preser- 

 ving the same direction as the rest, it bent 



