Introductory material

I

ON A PIECE OF CHALK [1868] (A Lecture delivered to the working men of Norwich during the meeting of the British Association.)

II

THE PROBLEMS OF THE DEEP SEA [1878]

III

ON SOME OF THE RESULTS OF THE EXPEDITION OF H.M.S. "CHALLENGER" [1875]

IV

YEAST [1871]

V

ON THE FORMATION OF COAL [1870] (A Lecture delivered at the Philosophical Institute, Bradford.)

VI

ON THE BORDER TERRITORY BETWEEN THE ANIMAL AND THE VEGETABLE KINGDOMS [1876] (A Friday evening Lecture delivered at the Royal Institution.)

VII

A LOBSTER; OR, THE STUDY OF ZOOLOGY [1861] (A Lecture delivered at the South Kensington Museum.)

VIII

BIOGENESIS AND ABIOGENESIS [1870] (The Presidential Address to the Meeting of the British Association for the Advancement of Science at Liverpool.)

IX

GEOLOGICAL CONTEMPORANEITY AND PERSISTENT TYPES OF LIFE [1862] (Address to the Geological Society on behalf of the President by one of the Secretaries.)

X

GEOLOGICAL REFORM [1869] (Presidential Address to the Geological Society.)

XI

PALAEONTOLOGY AND THE DOCTRINE OF EVOLUTION [1870] (Presidential Address to the Geological Society.)