144 HEREDITY AND EVOLUTION, IN PLANTS 



the sea. "I have never heard," he said, 1 "of a single seed 

 carried from England to France, nor from Ireland to 

 England by the agency of the west winds, although they 

 are so intense and so frequent in those countries. I do 

 not believe it has ever been demonstrated that seeds have 



FIG. 71. Alphonse De Candolle (1806-1893). Noted Swiss botanist 

 and student of plant geography. Author of Geographic Botanique 

 Raisonie. (From Ada Horli Bergiani.} 



fallen in Sardinia from Africa, in Corsica from Sardinia, 

 nor from Corsica to the coast of Genoa and Nice, although 

 the south winds are there very violent." Other students 

 have reached the same conclusion on similar negative 

 evidence. It has also been argued, on general grounds, 



1 Geographic Botanique Raisonte 2:614. Geneva, 1855. 



