Ever since the first volume appeared in 1969, this series has received good reviews in a variety of periodicals published in different corners of 'the world. It would seem that the work has fulfilled its purpose as outlined in the Preface to Volume 1. The rapidly increasing interest in surface and colloid science by people engaged in industrial research and development, and in environmental, ecological, medical, pharmaceutical, and other areas, justifies the continuation of such an effort. After nine volumes with John Wiley and Sons, this and subsequent volumes will-by mutual consent-be published by Plenum Press. The editor will do his best to maintain and, if possible, improve the quality of the contributions. While the fundamental philosophy will be preserved, some moderate graphical changes have taken place. These changes were done to enhance the readability and uniformity of the volumes. Occasionally, volumes may appear under the editorship of other scientists in the field. These volumes will be mainly devoted to techniques in surface and colloid science. For reasons of continuity a sequential numbering system will be used.

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1. Microcapsules: Their Preparation and Properties.- 1. Introduction.- 2. Methods of Preparation.- 3. Properties of Microcapsules.- 4. Conclusions.- References.- 2. Ultracentrifugal Stability of Emulsions.- 1. Introduction.- 2. Evolution of the Ultracentrifugal Method.- 3. Experimental Technique.- 4. Effect of Operating Variables on Ultracentrifugal Stability.- 5. Creaming or Sedimentation.- 6. Kinetics and Mechanism of Coalescence.- 7. Attempted Correlation of Ultracentrifugal Data and Shelf-Life Stability.- References.- 3. Coalescence of Secondary Emulsions in Fibrous Beds.- 1. Introduction.- 2. Applications from the Literature.- 3. Theory of Coalescence in Porous Media.- 4. Collision Frequency.- 5. Coalescence Frequency.- 6. Dispersed Phase Flow in the Porous Bed.- 7. Separation of Dispersed Material.- 8. Theory of Droplet Attachment and Release.- 9. Summary.- References.- 4. Stability of Colloidal Dispersions in Nonaqueous Media.- 1. Introduction.- 2. Experimental Methods.- 3. Kinetics of Flocculation.- 4. Potential Energy of Attraction.- 5. Repulsion Associated with Electric Charge.- 6. Stabilization by Adsorbed Layers.- References.- 5. Stability of Interfaces.- 1. Introduction.- 2. General Remarks on Stability Analysis.- 3. Techniques of Stability Analysis.- 4. Mechanical Effects on Interfacial Stability.- 5. Effects of Transport, Phase Transformation, and Chemical Reaction.- 6. Electrical Effects.- 7. Thin Liquid Films.- 8. Concluding Remarks.- References.- Author Index.