80 PLANARIA FELINA. 



conjecture, that the production would be 

 analogous to a head. Such regenerations, 

 for the most part, bear a general cast and 

 appearance which guide to anticipations of 

 their ultimate issue, and my belief was found- 

 ed on what I had previously beheld ; for al- 

 though analogical reasoning is not to be 

 trusted, if single and unsupported, still, when 

 combined with a series of facts, all uniform, 

 clear, and distinct, it is impossible to reject 

 it in our conclusions of events. Being unex- 

 pectedly enabled to resume inspection of the 

 planaria now alluded to, I discovered that 

 my conjecture had not been altogether falla- 

 cious. The origin of the protrusion on the 

 eighth of September was rather more than 

 half way down the side ; the whole anterior 

 part was surrounded by specks or stigmata, 

 and still greater activity testified in its 

 movements. Nature was evidently labour- 

 ing in the production of a head, though 

 tentacula were wanting : and if another un- 

 seasonable interruption had not taken place 

 on the fifteenth of the same month, I should 



