1. Laboratory methods in secondary production

   • R. D. Gulati

   OriginalPaper Pages: 255 - 268

2. An evaluation of productivity research in the aquatic environment. Some comments (abstract)

   • J. J. Beukema

   BriefCommunication Pages: 269 - 269

3. Biological assessment of water as a fundamental problem

   • P. J. Schroevers

   OriginalPaper Pages: 270 - 273

4. The suitability of diatoms for biological water assessment

   • Herman Van Dam

   OriginalPaper Pages: 274 - 284

5. The biological assessment of bodies of water by means of the macrofauna

   • L. W. G. Higler

   EditorialNotes Pages: 285 - 287

6. The assessment of water quality by the local stand of macrophytic vegetation (abstract)

   • L. de Lange

   BriefCommunication Pages: 288 - 289

7. A biological water analysis (abstract)

   • Th. G. N. Dresscher
   • H. Van Der Mark

   Abstract Pages: 289 - 289

8. Publications

   • L. R. Mur

   BookReview Pages: 290 - 291

9. Symposia

   Announcement Pages: 291 - 291

10. Miscellanea

    Legacy Pages: 292 - 293