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A PREFATORY LETTER.
I. ON THE ADVISABLENESS OF IMPROVING NATURAL KNOWLEDGE.
II. EMANCIPATION--BLACK AND WHITE.
III. A LIBERAL EDUCATION: AND WHERE TO FIND IT.
IV. SCIENTIFIC EDUCATION: NOTES OF AN AFTER-DINNER SPEECH.
V. ON THE EDUCATIONAL VALUE OF THE NATURAL HISTORY SCIENCES.
VI. ON THE STUDY OF ZOOLOGY.
VII. ON THE PHYSICAL BASIS OF LIFE.
VIII. THE SCIENTIFIC ASPECTS OF POSITIVISM.
IX. ON A PIECE OF CHALK. A LECTURE TO WORKING MEN.
X. GEOLOGICAL CONTEMPORANEITY AND PERSISTENT TYPES OF LIFE.
XI. GEOLOGICAL REFORM.
XII. THE ORIGIN OF SPECIES.
XIII. CRITICISMS ON "THE ORIGIN OF SPECIES."
XIV. ON DESCARTES' "DISCOURSE TOUCHING THE METHOD OF USING ONE'S REASON RIGHTLY AND OF SEEKING SCIENTIFIC TRUTH."