Part 2

11. Absorption of Radiant Heat by Vapours and Odours.

12. Aqueous Vapour in relation to the Terrestrial Temperatures.

13. Liquids and their Vapours in relation to Radiant Heat.

14. Reciprocity of Radiation and Absorption.

15. Influence of Vibrating Period and Molecular Form.

Physical Analysis of the Human Breath.

16. Summary and Conclusion.

III. ON RADIANT HEAT IN RELATION TO THE COLOUR AND CHEMICAL CONSTITUTION OF BODIES.

IV. NEW CHEMICAL REACTIONS PRODUCED BY LIGHT.

1. DECOMPOSITION BY LIGHT.

Physical Considerations.

Production of Sky-blue by the Decomposition of Nitrite of Amyl.

2. ON THE BLUE COLOUR OF THE SKY, & THE POLARISATION OF SKYLIGHT.

3. THE SKY OF THE ALPS.

V. ON DUST AND DISEASE.

Experiments on Dusty Air.

The Germ Theory of Contagious Disease.

Parasitic Diseases of Silkworms. Pasteur's Researches.

Origin and Propagation of Contagious Matter.

The Germ Theory applied to Surgery.

The Luminous beam as a means of Research.

The Floating Matter of the Air.

Dr. Bennett's Experiments.

Application of Luminous beams to Water.

Chalk-water. Clark's Softening Process.

Cotton-wool Respirator.

Fireman's Respirator.

Helmholtz on Hay Fever.