11. The Quantity of Latent Heat absorbed in Thawing. 12. The Quantity of Latent Heat absorbed in Evaporation. 13. The Law and Rate of Evaporation with regard to Heat. 14. The Law and Rate of the Expansion of Air by Heat. 15. The Quantity of Heat absorbed in the Expansion of Air. 16. The Law and Rate of the Passage of Aqueous Vapour through Air. 17. The Laws of Electricity; its relations to Air and Moisture. 18. The Fluidity, Density, and Elasticity of the Air, by means of which its vibrations produce Sound. 19. The Fluidity, Density, and Elasticity of the Ether, by means of which its vibrations produce Light. 2. These are the _data_, the _elements_, as astronomers call the quantities which determine a planet’s orbit, on which the mere _inorganic_ part of the universe is constructed. To these, the constitution of the organic world is adapted in innumerable points, by laws of which we can trace the results, though we cannot analyze their machinery. Thus, the vital functions of vegetables have periods which correspond to the length of the year, and of the day; their vital powers have forces which correspond to the force of gravity; the sentient faculties of man are such that the vibrations of air (within certain limits,) are perceived as sound, those of ether, as light. And while we are enumerating these correspondencies, we perceive that there are thousands of others, and that we can only select a very small number of those where the relation happens to be most clearly made out or most easily explained.