Darwin-Wallace Celebration. 39 



celebration of the fiftieth anniversary of the reading of the 

 joint Essay by Charles Darwin and Alfred Russel Wallace, 

 " On the Tendency of Species to form Varieties ; and on the 

 Perpetuation of Varieties and Species by Natural Means 

 of Selection." 



I have the honour to be, Sir, 



Your obedient Servant, 



(Signed) JOHN WILLIS CLARK, 



Registrary of the University. 



THE UNIVERSITY OF ST. ANDREWS (Prof. P. R. Scott 



Lang, M.A., B.Sc.), 

 with the following address : 



THE UNIVERSITY OF ST. ANDREWS appreciates highly the 

 honour of being invited by the Linnean Society of London 

 to join with it in celebrating the jubilee of the reading of 

 the joint essay by Charles Robert Darwin and Alfred 

 Russel Wallace, " On the Tendency of Species to form 

 Varieties; and on the Perpetuation of Varieties and Species 

 by Natural Means of Selection." 



During the fifty years that have since elapsed the views 

 promulgated on that day have given a vast impulse to the 

 study of Natural History, both by observation and experi- 

 ment, with a corresponding advance in the knowledge of 

 Biology. Nor has their influence been confined to this 

 science ; it may be said to have largely affected the methods 

 and the spirit of investigation in many, if not in all, 

 Departments of Study. 



It is an additional ground for congratulation that one of 

 the illustrious heroes of that day is still with us, and it is 

 our hope that he may long be spared to behold the wonderful 

 development of the ideas to which he gave birth, and has 

 been himself so great a contributor. 



We are pleased to think that in the course of its long 



