THE WALKING FERN AND HART'S-TONGUE. 271 



the legs of that animal. There are about half a dozen 

 species. The scientific name of our plant has been 

 frequently changed. It was long known as Scolopen- 

 drium vulgare or 5. officinarum; later it was called S. 

 Scolopendrium, and still later Phyllitis Scolopendrium. 

 Those who are interested in the plant rather than its 

 name will prefer to call it by its best known title, as 

 we have done, until the makers of nomenclature decide 

 upon a name that shall not be changed. 



