1. An improved technique for measuring assimilation efficiency by the ⁵¹Cr−¹⁴C twin tracer method

   • John A. Wightman

   OriginalPaper Pages: 273 - 284

2. The pH dependence of SO₂ damage to lichens

   • R. Türk
   • V. Wirth

   OriginalPaper Pages: 285 - 291

3. Environmental limitations of photosynthesis on a California evergreen shrub

   • H. A. Mooney
   • A. T. Harrison
   • P. A. Morrow

   OriginalPaper Pages: 293 - 301

4. The role of air humidity and temperature in controlling stomatal resistance of Prunus armeniaca L. under desert conditions

   • E. -D. Schulze
   • O. L. Lange
   • U. Buschbom

   OriginalPaper Pages: 303 - 314

5. The development of benthonic phytocoenosis on artificial substrates in the ticino river

   • Antonia Cattaneo
   • Sergio Ghittori
   • Valerio Vendegna

   OriginalPaper Pages: 315 - 327

6. A study on the population dynamics of the perennial plant species Chamaenerion angustifolium (L.) scop.

   • J. van Andel

   OriginalPaper Pages: 329 - 337

7. Interactions between photoperiodism and temperature with respect to the control of dormancy in the adult stage of Pterostichus oblongopunctatus F. (Col., Carabidae)

   • H. U. Thiele
   • H. Könen

   OriginalPaper Pages: 339 - 343

8. Some features influencing the efficiency of pitfall traps

   • M. L. Luff

   OriginalPaper Pages: 345 - 357

9. Apparent host selection by some african tick species

   • John MacLeod

   OriginalPaper Pages: 359 - 370