2.IX.VII.Geological Action of Earth-worms, 1880-1882.

2.IX.VIII.Miscellaneous, 1846-1878.
CHAPTER 2.X .-- Botany, 1843-1871.

2.X.I.Miscellaneous, 1843-1862.
2.X.II.Melastomaceae, 1862-1881.

2.X.III.Correspondence with John Scott, 1862-1871.
CHAPTER 2.XI .-- Botany, 1863-1881.

2.XI.I.Miscellaneous, 1863-1866.
2.XI.II.Correspondence with Fritz Muller, 1865-1881.