VI. THE METHOD BY WHICH THE CAUSES OF THE PRESENT
AND PAST CONDITIONS OF ORGANIC NATURE ARE TO
BE DISCOVERED.--THE ORIGINATION OF LIVING BEINGS 186
VII. THE PERPETUATION OF LIVING BEINGS, HEREDITARY
TRANSMISSION AND VARIATION 208
VIII. THE CONDITIONS OF EXISTENCE AS AFFECTING
THE PERPETUATION OF LIVING BEINGS 225
IX. A CRITICAL EXAMINATION OF THE POSITION OF MR.
DARWIN'S WORK, "ON THE ORIGIN OF SPECIES," IN
RELATION TO THE COMPLETE THEORY OF THE CAUSES
OF THE PHENOMENA OF ORGANIC NATURE 245
X. ON THE EDUCATIONAL VALUE OF THE NATURAL
HISTORY SCIENCES 264
(Lecture delivered at St. Martin's Hall,
July 22, 1854).