1. Multiculturism versus the single microbe / M. Dworkin -- 2. Multicellularity: the rule, not the exception: Lessons from Escherichia coli colonies / J. A. Shapiro -- 3. Pheromone-inducible conjugation in Enterococcus faecalis: Mating interactions mediated by chemical signals and direct contact / R. E. Ruhfel, B. A. B. Leonard and G. M. Dunny -- 4. N-acyl-L-homoserine lactone autoinducers in bacteria: Unity and diversity / P. V. Dunlap -- 5. Cyanobacteria / D. G. Adams -- 6. Mycelial life style of Streptomyces coelicolor A3(2) and its relatives / K. F. Chater and R. Losick -- 7. Proteus mirabilis and other swarming bacteria / R. Belas -- 8. Myxobacterial multicellularity / L. J. Shimkets and M. Dworkin -- 9. Oral Microbiology and Coaggregation / P. E. Kolenbrander -- 10. Flow cytometry: Useful tool for analyzing bacterial populations cell by cell / B. Hauer and H. Eipel.

11. In situ analyses of microbial populations with molecular probes: Phylogenetic dimension / N. K. Fry, L. Raskin and R. Sharp [et al.] -- 12. Physical and genetic consequences of multicellularity in Bacillus subtilis / N. H. Mendelson, B. Salhi and C. Li -- 13. Formation of colony patterns by a bacterial cell population / M. Matsushita -- 14. Cooperative formation of bacterial patterns / E. Ben-Jacob and I. Cohen -- 15. Collective behavior and dynamics of swimming bacteria / J. O. Kessler and M. F. Wojciechowski.