No. 539] ORIGIN OF SPECIES IN NATURE 659 



more than once and directly from the parent species. 

 This is the view taken by Clos, 44 who describes the find- 

 ing by P. Barthes of a plant of C. ma jus f urn arice folium 

 in Soreze, Tarn. It is to be noted that these plants bore 

 underdeveloped, seedless pods. This last seems to speak 



in favor of the assumption of a creatio de novo, since 

 plants from other stock appear fertile. To this ex- 

 tremely interesting point, a discussion of which falls 

 outside the scope of the present paper, I hope to return 

 in an article shortly to be published. 



The correctness of the view that the same mutation or 

 at least a mutation in the same general direction may 

 take place in different stocks, must be granted a priori. 

 Evidence in the support of this belief we find in the ex- 



