1. Can the Earth's magnetic field be simulated in the laboratory?

   • U. Müller
   • R. Stieglitz

   REVIEW ARTICLE 24 July 2000 Pages: 381 - 390

2. Polymerization of humic substances by an enzyme-catalyzed oxidative coupling

   • A. Piccolo
   • A. Cozzolino
   • R. Spaccini

   SHORT COMMUNICATION 24 July 2000 Pages: 391 - 394

3. Pheromonal contest between honeybee workers (Apis mellifera capensis)

   • R. F. A. Moritz
   • U. E. Simon
   • R. M. Crewe

   SHORT COMMUNICATION 24 July 2000 Pages: 395 - 397

4. The action spectrum for maximal photosensitivity of germination

   • K. M. Hartmann
   • A. Mollwo

   SHORT COMMUNICATION 24 July 2000 Pages: 398 - 403

5. Female bushcrickets mated with parasitized males show rapid remating and reduced fecundity (Orthoptera: Phaneropteridae: Poecilimon mariannae)

   • G. U. C. Lehmann
   • A. W. Lehmann

   SHORT COMMUNICATION 24 July 2000 Pages: 404 - 407

6. Maintaining an ant-plant symbiosis: secondary polygyny in the Macaranga triloba-Crematogaster sp. association

   • H. Feldhaar
   • B. Fiala
   • U. Maschwitz

   SHORT COMMUNICATION 24 July 2000 Pages: 408 - 411

7. “You are what you eat”: Diet modifies cuticular hydrocarbons and nestmate recognition in the Argentine ant, Linepithema humile

   • D. Liang
   • J. Silverman

   SHORT COMMUNICATION 24 July 2000 Pages: 412 - 416

8. Early evolution of discoglossid frogs: new evidence from the Mesozoic of China

   • Y. Wang
   • K. Gao
   • X. Xu

   SHORT COMMUNICATION 24 July 2000 Pages: 417 - 420

9. Book review

   OriginalPaper 24 July 2000 Pages: 421 - 422