xii CONTENTS. 



CHAPTER IV. 



PAGE 



The Number of Nuclei Produced by Shaking Different Liquids, and Allied Experiments. 47 

 I. Explanation. 2. Data. 3. Coronas in general. 4. Axial colors. 5. Carbon di- 

 sulphide. 



CHAPTER V. 



Diffusion of Vapor into Nucleated Air; a Correction 51 



I. Apparatus and manipulation. 2. Equation. 3. Application and data. 4. Con- 

 clusions. 5. Diffusion from greater to less saturation. 6. Crucial experiment and 

 conclusion. 7. Nuclei produced by mixture of coal gas and air. 



CHAPTER VI. 



Periodic Color Distributions in Relation to the Coronas of Cloudy Condensation, with a 



Revision of the Constants of Coronas 56 



Introduction. 



I. Purpose and plan. 2. Apparatus. 3. Color distributions. 4. .Apertures. 



Data for the Welsbach Gas Burner. 



5. E.xplanation of the tables and notation. 6. Charts. 7. Tables. 



Method of Reduction. 



8. Constants of the geometric sequence. 9. Time losses. 10. Exhaustion losses. 11. 

 Losses attributed to subsidence. 12. The optic constant. Diffraction methods. 13. 

 The optic constant. Subsidence methods. 14. Summary of optic constants. 15. Re- 

 sulting equations applied. 16. Remarks on the tables and graphs. 17. Diameter of 

 fog particles. 



Data with Electric and Mono-Chromatic Light. 



18. Tables. 19. Charts. 20. Diameters of cloud particles. 



Miscellaneous Experiments with Deep Vessel. 



21. Aperture of white disc. 22. Tables for the coronas. 23. Remarks on the table and 

 graphs. 24. Condensation chamber remote from the eye. 



Long and Shallow Condensation Chambers. 



25 Apparatus. 26. Reduction of data and tables. Sp = 17 cm. 27. Smaller and 

 larger pressure differences. 28. Remarks on the tables. 29. Nucleation of the green 

 coronas. 



Other Causes of Change in the Types of Coronas. 



30. Thickness of cloud layer. 31. Obliquity of diffraction. 32. Effect of wave length. 



Different Speeds of Exhaustion for a Given Pressure Difference. 



7,7,. Increased suddenness of condensation. 34. Results. 35. Growth of nuclei. 36. 

 Subsidence. 37. Exhaustion ratio. 38. Inferences. 39. Dififerent exhaustion rates 

 for moderate nucleations. 40. Conclusion. 



CHAPTER VTI. 



Direct Micro-metric and Micro-photographic Measureinent of Fog Particles, with a 



Summary of all Relevant Data 10 1 



I. Micrometry of Fog Particles. 



Earlier Methods. 



I. Introductory. 2. .Apparatus. 3. Behavior of the precipitated droplets. 4. Pre- 

 liminary data. 



