1. Response of soil nematodes, rotifers and tardigrades to three levels of season-long sulfur dioxide exposures

   • J. W. Leetham
   • T. J. McNary
   • W. K. Lauenroth

   OriginalPaper Pages: 343 - 356

2. Effect of humic acid on copper adsorption by Kaolin

   • Gian C. Gupta
   • Florence L. Harrison

   OriginalPaper Pages: 357 - 360

3. The potential acidity associated with dews, frosts, and fogs

   • Joe Wisniewski

   OriginalPaper Pages: 361 - 377

4. Sulphur gas emissions in the boreal forest: The west whitecourt case study

   • A. H. Legge

   OriginalPaper Pages: 379 - 398

5. Field tests of a linear gradient system for exposure of row crops to S02 and HF

   • J. A. Laurence
   • D. C. Maclean
   • K. S. Hansen

   OriginalPaper Pages: 399 - 407

6. The effects of mercury, copper, and zinc on calcium uptake by larvae of the clam, mulinia lateralis

   • Ming-Shan Ho
   • Paul L. Zubkoff

   OriginalPaper Pages: 409 - 414

7. Influence and prevention of bird-droppings in precipitation chemistry experiments

   • Willem A. H. Asman
   • Taeke B. Ridder
   • Jakob Slanina

   OriginalPaper Pages: 415 - 420

8. Book reviews

   • K. C. Pillai
   • J. Smeets
   • T. Viraraghavan

   BookReview Pages: 421 - 436

9. Announcements

   Announcement Pages: i - i