FLIGHT OF PLANTS AND ANIMALS. 



423 



before but dimly perceived — that there was a remarkable 

 resemblance between the existing plants of eastern Asia and 

 those of eastern North America, that more species are com- 

 mon to Japan and Europe than to Japan and western North 



America, and that the resemblance is greatest of all between 

 Japan and eastern North America. Out of three hundred 

 species, common to the temperate regions of eastern A si a 



