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Nature 426, 613 (11 December 2003) | doi:10.1038/426613a

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100 and 50 years ago

For some years a very interesting series of experiments in connection with the biological method of sewage treatment has been carried on by Dr. Dunbar, director of the Hygienisches Institut at Hamburg, and by his colleagues. Special attention has been directed to the elucidation of the sequence of changes which underlies the purification process in contact beds and percolating filters... Great importance is attached by the Hamburg workers to the role played by the process of so-called "absorption" which takes place when the liquid is in contact with the purifying medium.