74? PLANARIA FELINA. 



will generally, if not invariably, give birth 

 to a new and additional body, which, in 

 progress of time, approaches the dimensions 

 of the integral animal, and exhibits the 

 same functions and properties by which it 

 is distinguished. 



Where the chief object has a partial fai- 

 lure, other gradations of monstrosity are un- 

 folded, which undergo successive altera- 

 tions. In watching the result of an expe- 

 riment, I saw two rude and mis-shapen 

 heads, united close Jby the neck, protrude 

 from asevered fragment, which had once 

 constituted the posterior part of a pla- 

 naria. The fragment bore an imperfect 

 resemblance to a circular arc ; whence its 

 motion, instead of being in a direct line, 

 described irregular curves. Five weeks af- 

 ter this remark, the regeneration of the 

 two heads, still in intimate union, was com- 

 pleted^ but the distortion of the body re- 

 mained. However, a greater interval ha- 

 ving elapsed, the whole grew into shape. 

 The two heads were then seen farther apart: 



