CONTENTS. 3d 



XIII. 



PAOK 



Criticisms on "TnE Origin op Species." (The Natural History 

 Beview, 1SG4) 299 



XIV. 



On Descartes' " Discourse touching the Method of using One's 

 Reason rightly and op seeking Scientific Truth." (An 

 Address to the Cambridge Young Men's Christian Society, delivered 

 on the 24th of March, 1S70, and subsequently published in 

 Macmillau's Magazine) ..„,..,,...,,.♦ 82C 



XV. 



BroNTANEOus Geneeation. (An Address delivered before the British 

 Association for tbe Advancement of Science, at the Liverpool 

 meeting, September, 1870, and published in Nature) .... 345 



