CONTENTS. xi 



XIII. 



PAGE 



CRITICISMS ON &quot;THE ORIGIN OF SPECIES.&quot; (The Natural History 



Review, 1864) 260 



XIV. 



ON DESCARTES &quot; DISCOURSE TOUCHING THE METHOD OF USING ONE S 

 REASON RIGHTLY AND OF SEEKING SCIENTIFIC TRUTH.&quot; (An 

 Address to the Cambridge Young Men s Christian Society, delivered 

 on the 24th of March, 1870, and subsequently published in 

 Macmillan s Magazine) 279 



