PLANARIA FELINA. 79 



tember, a projection perceptibly vegetated 

 from the side of a planaria in the end of the 

 subsequent month. The animal fed abun- 

 dantly, and on the tenth of December I was 

 sensible that it was about to become a head. 

 These reproductions of uncertain issue are 

 longer of demonstrating their real charac- 

 ter, than those which, from an early stage, 

 leave no opportunity for doubt : the one is 

 completed before the other assumes its 

 leading features. They are not totally de- 

 pendent on the art of the experimentalist; 

 though examples in the natural state are 

 extremely rare. In the first week of Au- 

 gust 1812, I took a number of planariae. 

 Some time afterwards, my attention was 

 attracted by the protrusion of an organic 

 substance from within about a third of the 

 posterior extremity of one of them, which, 

 as it enlarged, exhibited active motions and 

 inclinations, resembling those, as in the for- 

 mer case, proper to the anterior portion. 

 Circumstances compelled me to abandon 

 my observations, by which I was then led to 



