1. Structural and systematic; 2. Mode of life; 3. the external features of earthworms and their relation to habit and environment; 4. Sense organs and senses of earthworms; 5. Relative frequency of earthworms in different regions of the world; 6. Peregrine forms; 7. The earthworms of Oceanic islands; 8. Movement and migration among earthworms; 9. The geographical distribution of earthworms; List of literature referring to earthworms; Index.