﻿lxxvi PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [vol. lxxii, 



of service to the Society one of the most pleasant and memorable 

 episodes of my life. My own special studies are so completely on 

 the borderland of our science, that I fear I must sometimes have 

 wearied you with matters that seem almost extraneous ; but it is 

 one of the greatest charms of geology that it needs co-operation 

 with the whole circle of the sciences to further its aims. You 

 have now turned from palaeontology to petrology, and I have 

 much pleasure in resigning the Presidential Chair to an old friend, 

 an accomplished Fellow who has indeed delved deeply into the 

 mineral structure of the Earth. 



