1. To our readers and authors

   Announcement Pages: 609 - 609

2. Anaerobic bacterial dissolution of lead oxide

   • A. J. Francis
   • C. J. Dodge

   OriginalPaper Pages: 611 - 616

3. Quantitative ultrastructural changes associated with lead-coupled luxury phosphate uptake and polyphosphate utilization

   • Linda Sicko-Goad
   • Diane Lazinsky

   OriginalPaper Pages: 617 - 627

4. Effects of endogenous and exogenous thiols on the distribution of mercurial compounds in mouse tissues

   • M. Aihara
   • R. P. Sharma

   OriginalPaper Pages: 629 - 636

5. Effects of nabam on developingXenopus laevis embryos: Minimum concentration, biological stability, and degradative products

   • William X. Birch
   • K. V. Prahlad

   OriginalPaper Pages: 637 - 645

6. The effect of carbaryl and malathion in combination on γ-glutamyl transpeptidase and glutathione S-alkyltransferase activityin vitro

   • D. Waidron Lechner
   • M. S. Abdel-Rahman

   OriginalPaper Pages: 647 - 651

7. Effect of phenobarbital on the delayed neurotoxicity of leptophos in hens

   • Nobuhiro Konno
   • Kiyoshi Katoh
   • Masaaki Fukushima

   OriginalPaper Pages: 653 - 659

8. Studies on the environmental fate of carbaryl as a function of pH

   • S. Warwick Fisher
   • Timothy W. Lohner

   OriginalPaper Pages: 661 - 667

9. Studies on the vaporization of pentachlorophenol from treated wood

   • L. L. Ingram Jr.
   • G. D. McGinnis
   • L. R. Gjovik

   OriginalPaper Pages: 669 - 676

10. Factors affecting the exposure of ground- rig applicators to 2,4-D dimethylamine salt

    • R. Grover
    • A. J. Cessna
    • K. Yoshida

    OriginalPaper Pages: 677 - 686

11. A congener analysis of polychlorinated biphenyls accumulating in rat pups after perinatal exposure

    • William Shain
    • Stephen R. Overmann
    • Brian Bush

    OriginalPaper Pages: 687 - 707

12. Transfer and distribution of accumulated (¹⁴C)polychlorinated biphenyls from maternal to fetal and suckling rats

    • Yasuhiro Takagi
    • Satoshi Aburada
    • Toshiyuki Kitaura

    OriginalPaper Pages: 709 - 715

13. LC₅₀ test results in polychlorinated biphenylfed mink: Age, season, and diet comparisons

    • T. C. Hornshaw
    • J. Safronoff
    • R. J. Aulerich

    OriginalPaper Pages: 717 - 723

14. Localization of ultrastructural alterations induced in rat liver by dietary polybromobiphenyls (FireMaster BP-6)

    • Brian T. Raber
    • John W. Carter

    OriginalPaper Pages: 725 - 732

15. Decreased phagocytosis and superoxide anion production in alveolar macrophages of rats exposed to nitrogen dioxide

    • Takahito Suzuki
    • Shingo Ikeda
    • Isao Mizoguchi

    OriginalPaper Pages: 733 - 739

16. The precision of daphnid (Daphnia magna Straus, 1820) static acute toxicity tests

    • F. M. Gersich
    • F. A. Blanchard
    • C. N. Park

    OriginalPaper Pages: 741 - 749

17. Effect of adult mallard age on avian reproductive tests

    • Jay D. Gile
    • S. Mark Meyers

    OriginalPaper Pages: 751 - 755

18. Mallard reproductive testing in a pond environment: A preliminary study

    • S. Mark Meyers
    • Jay D. Gile

    OriginalPaper Pages: 757 - 761