CONTEXTS. IX 



ON SENSATION AND THE UNITY OF STRUCTURE OF THE 

 SENSIFEROUS ORGANS. 



An Evening Lecture at the Royal Institution, Friday, March 7, 1879. 

 Nineteenth Century, 1879 . . Pages 246 to 273 



XL 



EVOLUTION IN BIOLOGY. 

 The Encyclopedia Britannica, Ninth Edition, vol. viii. 1878 274to309 



XII. 



THE COMING OF AGE OF "THE ORIGIN OF SPECIES." 



An evening Lecture at the Royal Institution, Friday, 9th April 1880. 

 Nature, 1880 , . . 310 to 324 



XIIL 

 THE CONNECTION OF THE BIOLOGICAL SCIENCES WITH MEDICINE. 



Aii Address delivered at the Meeting of the International Medical 

 Congress in London, 9th August 1881 . . 325 to 349 



