Ⅰ．TISSUE CULTURE METHODS 3
Ⅰ．The Mammalian Cell as Microorganism＆By Theodore T．Puck 3
Ⅱ．The Multiplication of RNA-Containing Animal Viruses＆By R．Dulbecco 19
Ⅲ．Growth and Differentiation of Plant Tissue Cultures＆By Richard M．Klein 31
Ⅱ．CYCLIC ACTIVITY 59
Ⅳ．Relations Between Cell Growth and Cell Division＆By David M．Prescott 59
Ⅴ．An Oscillator Model for Biological Clocks＆By Colin S．Pittendrigh and Victor G．Bruce 75
Ⅵ．Endogenous Diurnal Cycles of Activity in Plants＆By E．Bünning 111
Ⅲ．BIOCHEMICAL EVOLUTION 217
Ⅶ．Photosynthesis and the Origin of Life＆By H．Gaffron 217
Ⅷ．On the Origin of Self-Replicating Systems＆By Harold F．Blum 155
Ⅸ．Some Energy Transduction Problems in Photosynthesis＆By Bernard L．Strehler 171
Ⅹ．Photosynthesis and Life on Other Planets:A Summary＆By Harlow Shapley 201
Index for the Fifteenth Symposium 207
Cumulative Author Index 213