Preface; 1. Introduction; 2. William Herschel's observations and parallel activities; 3. John Herschel's Slough observations; 4. Discoveries made in parallel with John Herschel's Slough; 5. John Herschel at the Cape of Good Hope; 6. The time after Herschel's observations till Auwers' list of new nebulae; 7. Compiling the General Catalogue; 8. Dreyer's first catalogue: the supplement to Herschel's General Catalogue; 9. Compilation of the New General Catalogue 356; 10. The New General Catalogue: publication, analysis and effects; 11. Special topics; 12. Summary; Appendices; Index.