XI.

GEOLOGICAL REFORM. (The Anniversary Address to the Geological
Society for 1869) 251

XII.

THE ORIGIN OF SPECIES. (The _Westminster Review_, April 1860) 280

XIII.

CRITICISMS ON "THE ORIGIN OF SPECIES." (The _Natural History
Review_, 1864) 328

XIV.

ON DESCARTES' "DISCOURSE TOUCHING THE METHOD OF USING ONE'S
REASON RIGHTLY AND OF SEEKING SCIENTIFIC TRUTH." (An Address to
the Cambridge Young Men's Christian Society, delivered on the
24th of March, 1870, and subsequently published in
_Macmillan's Magazine_) 351




LAY SERMONS, ADDRESSES, AND REVIEWS.