FORMATION AND EARLY EVOLUTION OF THE EARTH. -- The origin and evolution of the solar system / A.G.W. Cameron -- The origin of the earth / Harold C. Urey -- The earth / Raymond Siever -- PREBIOTIC CHEMISTRY. -- The chemistry of the solar system / John S. Lewis -- The origin of life / George Wald -- The amateur scientist: experiments in generating the constitutents of living matter from inorganic substances / C.L. Stong -- PROTOCELLS AND FOSSILS. -- The oldest fossils / Elso S. Barghoorn -- Chemical fossils / Geoffrey Eglington and Melvin Calvin -- THE EARLY EVOLUTION OF LIFE. -- The genetic code: III / F.H.C. Crick -- Symbosis and evolution / Lynn Margulis -- Computer analysis of protein evolution / Margaret Oakley Dayhoff -- EXTRATERRESTRIAL LIFE. -- The search for life on Mars / Norman H. Horowitz -- Life outside the solar system / Su-Shu Huang