NOTES AND EXHIBITS. 305 



Discussion. — After a brief exposition of President Jordan's 

 views on the subject of geminate species, Mr. Fletcher proceeded 

 to a consideration of the application of Jordan's law to the case 

 of the Australian Batrachia. Mr. Froggatt discussed the case 

 of the Australian Cicadidpe; Mr. Tillyard that of Australian 

 Dragon-flies; Mr. S. J. Johnston weighed the evidence fur- 

 nished by certain groups of vertebrates and plants, and ojffered 

 some criticism of the Law on the ground that it conceded too 

 much weight to geographical isolation, and not enough to physio- 

 logical isolation; Dr. Chapman brought forward some theoretical 

 considerations; and Mr. Maiden discussed the case of Australian 

 plants particularly Eucalypts. On the motion of Mr. Basset 

 Hull, the discussion was adjourned to next Meeting. 



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