Max Planck Institute for Chemistry

Telephone: +49-(0)6131-305-493

Biogeochemistry Department

Telefax: +49-(0)6131-305-487

P.O. Box 3060

e-mail: meixner@mpch-mainz.mpg.de

55020 Mainz, Germany

For Federal Express etc., street address is:

Joh.-J.-Becher-Weg 27, 55128 Mainz, Germany

Department of Physics

Telephone: +263-4-303211

University of Zimbabwe

Telefax: +263-4-333407

P.O. Box MP 167

Mount Pleasant

Harare, Zimbabwe