1. Publisher's notice

   Announcement Pages: iii - iii

2. Publisher's announcement

   Announcement Pages: iv - iv

3. Commentary life on Mars — A reply

   • Norman H. Horowitz

   ReviewPaper Pages: 309 - 310

4. The evolution of nitrogen cycling

   • Rocco L. Mancinelli
   • Christopher P. McKay

   OriginalPaper Pages: 311 - 325

5. The influence of prebiotic-type organic molecules on the crystallization of Al and Mg hydroxides

   • P. M. Costanzo
   • P. Laszlo

   OriginalPaper Pages: 327 - 345

6. The biogeochemical cycle of the adsorbed template II: Selective adsorption of mononucleotides on adsorbed polynucleotide templates

   • Daniel Lazard
   • Noam Lahav
   • James B. Orenberg

   OriginalPaper Pages: 347 - 357

7. The polymerization of amino acid adenylates on sodium-montmorillonite with preadsorbed polypeptides

   • Mella Paecht-Horowitz
   • Frederick R. Eirich

   OriginalPaper Pages: 359 - 387

8. Formate ester formation in amide solutions

   • Allen M. Schoffstall
   • Saralyn M. Mahone

   OriginalPaper Pages: 389 - 396

9. Acetylene as a substrate in the development of primordial bacterial communities

   • Charles W. Culbertson
   • Francis E. Strohmaier
   • Ronald S. Oremland

   OriginalPaper Pages: 397 - 407