Tuatara: Volume 18, Issue 3, December 1970

Contents

Contents

The Optical Coincidence System of Indexing Information. P. S. Dale 97
The Application of Electron Microscopy to the Study of some Interesting Spiral Microorganisms found in Pond Water Collected at Otari Plant Museum, Wellington. J. E. Sheridan, Jan Steel and M. N. Loper 103
Palaeoclimatic Change in the Last 1,000 Years. G. N. Park 114
Circadian Rhythms. Graham S. Hardy 124
Concepts in Vegetation/Soil Dynamics. G. N. Park 132
Notice and Reviews. 145