A collection of Kelvin's scientific lectures on geology, together with uncollected talks given between 1866 and 1893.

12. Protection of vegetation from cold; 13. The 'doctrine of uniformity' in geology briefly refuted; 14. On geological time; 15. On geological dynamics; 16. Presidential address to the British Association, Edinburgh, 1871; 17. Presidential address to the Society of Telegraph Engineers, 1874; 18. Review of evidence regarding the physical condition of the earth; 19. Geological climate; 20. The internal condition of the earth as to temperature, fluidity, and rigidity; 21. Polar ice-caps and their influence in changing sea levels; 22. On the rate of a clock or chronometer as influenced by the mode of suspension; 23. On a new astronomical clock; 24. On beats of imperfect harmonies; 25. On the origin and transformation of motive power; 26. On the sources of energy in nature available to man for the production of mechanical effect; 27. On the dissipation of energy; 28. The Bangor laboratories; 29. Presidential addresses; 30. Address delivered on the occasion of the unveiling of Joule's statue in Manchester Town Hall; 31. Isoperimetrical problems; Index.