150 



MES. E. M. REID : A COMPARATIVE [vol. lxxvi,. 



the Pliocene, the five principal Pliocene seed-floras were then 

 compared on the hasis indicated above. 



The table of results is given on p. 149 ; but I wish at this point to 

 make it clear that the species were selected for comparison purely 

 on the grounds stated above. I had no idea, except in a general 



Fig. 1. — Comparative rates of extinction of Chinese-North 

 American species and flora as a whole, in Western Europe. 



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Percentages of exotic Chinese - North American Species ( some extinct). 



wa} r , what the outcome of the comparison would be. In my mind, 

 I had placed the floras in the relative positions which they were 

 found to occupy ; but that was all. Whether a critical examination 

 would bear out the impression gained as to their ages, it was 

 impossible to judge. 



Except that the table showed a general accord with my ideas as 

 to the relative positions of the floras, it was a little disappointing. 



