1. In memory of Professor Dr. Paul van Oye (1886–1966)

   • F. Evens

   Legacy 01 June 1970 Pages: II - II

2. List of publications

   Legacy 01 June 1970 Pages: XIII - XIII

3. Introduction

   EditorialNotes 01 June 1970 Pages: XXIX - XXIX

4. A flowing reaction vessel

   • Allen W. Knight

   OriginalPaper 01 June 1970 Pages: 1 - 1

5. Taxonomische Einheiten in der Algologie

   • Bohuslav Fott

   OriginalPaper 01 June 1970 Pages: 7 - 16

6. Horizontal zonation of macrovegetation, water properties and macrofauna in a littoral stand of Glyceria aquatica (L.) Wahlb. in a pond in South Bohemia

   • Jan Dvokřák

   OriginalPaper 01 June 1970 Pages: 17 - 17

7. Physicochemical conditions of deposition of bacillariophyta in Davis Lake, Klamath and Deschutes Counties, Oregon, U.S.A.

   • S. Messina-Allen
   • Sam L. Vanlandingham

   OriginalPaper 01 June 1970 Pages: 31 - 44

8. An ecological study of the algae of the River Moosi, Hyderabad (India) with special reference to water pollution IV. Periodicity of some common species of algae

   • V. Venkateswarlu

   OriginalPaper 01 June 1970 Pages: 45 - 48

9. Unser Zuwachs an Kenntnissen über die aus Afrika bekannten Wassermilben (Hydrachnellae, Acari)

   • Kurt O. Viets

   OriginalPaper 01 June 1970 Pages: 65 - 126

10. Limnological studies on freshwater ponds of Hyderabad-India I. The Biotope

    • Mohiuddin Munawar

    OriginalPaper 01 June 1970 Pages: 127 - 127

11. Investigations on the pigments of the Apus cancriformis (Bosc.) (Crustacea : Branchiopoda)

    • B. Czeczuga
    • R. Czerpak

    OriginalPaper 01 June 1970 Pages: 163 - 163

12. Libri novi

    Legacy 01 June 1970 Pages: 174 - 175

13. Erratum

    Announcement 01 June 1970 Pages: 176 - 176